Complete classic literature • Five-line readings • Clear US narration
VELMORA ACADEMY
Academy of Archival Languages & Memory Studies
Menu Close
The Boy's Playbook of Science
The Boy's Playbook of Science

Chapter V

Chapter 5 of The Boy's Playbook of Science is here in full — 90 sentences across 18 reading sections, with audio for every sentence and word.

Cover illustration for The Boy's Playbook of Science
Context Illustration Reading 1/18 · 5 lines
English subtitles · tap any word to listen 1 / 5
CENTRE OF GRAVITY.
_That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.
In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.
Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.
If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.
0:00 / 0:00
Speed 0.75x
AI-generated narration by OpenAI · Slow US English
LEARNER DICTIONARY
Archivist
/ˈɑːrkɪvɪst/
Editorial verification pending

A keeper or guardian of historical records and memories.

The Boy's Playbook of Science

Chapter V

Chapter 5 of The Boy's Playbook of Science is here in full — 90 sentences across 18 reading sections, with audio for every sentence and word.

Reading 1/18 · 5 reading units · Lines 1–5

Line 1
CENTRE OF GRAVITY.
/ˈsentər ʌv ˈɡrævəti/
Line 2
_That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.
/ðæt pɔɪnt əˈbaʊt wɪtʃ ɔːl ðə pɑːrts ʌv ə ˈbɑːdi duː ɪn ˈeni ˌsɪtʃuːˈeɪʃən ɪɡˈzæktli ˈbæləns iːtʃ ˈʌðər ðə dɪˈskʌvəri ʌv ðɪs fækt ɪz duː tuː ˌɑːrkəˈmiːdiz ənd ɪt ɪz ə pɔɪnt ɪn ˈevəri ˈsɑːləd ˈbɑːdi ˌwʌˈtevər ðə fɔːrm meɪ biː ɪn wɪtʃ ðə ˈfɔːrsɪz ʌv ˈɡrævəti meɪ biː kənˈsɪdərd æz juːˈnaɪtɪd/
Line 3
In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.
/ɪn ˈaʊər ɡloʊb wɪtʃ ɪz ə sfɪr ɔːr ˈræðər æn ɑːˈbleɪt ˈsfɪrɔɪd ðə ˈsentər ʌv ˈɡrævəti wɪl biː ðə ˈsentər/
Line 4
Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.
Line 5
If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

Learner Dictionary

These definitions explain words found in the current reading and keep every example grounded in its original sentence.

Oxford-style entry order: headword, part of speech, US IPA, concise definition, contextual example, and audio.

Archimedes noun US /ˌɑːrkəˈmiːdiz/

Greek mathematician and physicist noted for his work in hydrostatics and mechanics and geometry (287-212 BC)

From this reading “_That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.”

fabled adjective US /ˈfeɪbəld/

celebrated in fable or legend

From this reading “If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.”

momentum noun US /moʊˈmentəm/

an impelling force or strength

From this reading “If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.”

oblate noun US /ɑːˈbleɪt/

a lay person dedicated to religious work or the religious life

From this reading “In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.”

parallel noun US /ˈperəlel/

something having the property of being analogous to something else

From this reading “Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.”

plummet verb US /ˈplʌmət/

drop sharply

From this reading “Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.”

sphere noun US /sfɪr/

a particular environment or walk of life

From this reading “In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.”

spheroid noun US /ˈsfɪrɔɪd/

a shape that is generated by rotating an ellipse around one of its axes

From this reading “In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.”

Word partnerships in these lines

English keeps certain words together, and knowing the pair is worth more than knowing each word alone. Every partnership below was counted across our whole published library, and earns its place by appearing far more often than two unrelated words of the same frequency would.

Shown as this reading writes them, with the form the library counts, what kind of pairing it is, and how often it occurs.

solid body adjective + noun

In this reading “_That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.”

on the surface preposition + article + noun counted as “on … surface”

In this reading “Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.”

by side preposition + noun

In this reading “Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.”

All words in this reading · 91

Every word in these five lines is listed here, and every one of them can be played on its own.

Dictionary details are shown only when verified; these are not licensed Oxford entries.

adeterminerUS /ə/

used before a singular noun to mean one of a group, when it is not a particular one

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

aboutprepositionUS /əˈbaʊt/

on the subject of; concerning

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

alladjectiveUS /ɔːl/

(quantifier) used with either mass or count nouns to indicate the whole number or amount of or every one of a class

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

allowverbUS /əˈlaʊ/

make it possible through a specific action or lack of action for something to happen

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

andeterminerUS /æn/

the form of “a” used before a word that begins with a vowel sound

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

andconjunctionUS /ənd/

used to join words or parts of a sentence that go together

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

anyadjectiveUS /ˈeni/

one or some or every or all without specification

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

ArchimedesnounUS /ˌɑːrkəˈmiːdiz/

Greek mathematician and physicist noted for his work in hydrostatics and mechanics and geometry (287-212 BC)

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

asconjunctionUS /æz/

at the same time that; because; in the way that

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

balanceverbUS /ˈbæləns/

bring into balance or equilibrium

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

beauxiliary verbUS /biː/

used with a past participle to form the passive, or with -ing for continuous tenses

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

beyondprepositionUS /bɪˈɑːnd/

on the far side of; further than

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

bodynounUS /ˈbɑːdi/

the entire physical structure of an organism (an animal, plant, or human being)

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

boreverbUS /bɔːr/

cause to be bored

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

byprepositionUS /baɪ/

showing who or what does the action

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

cannot

Dictionary entry pending editorial verification. Tap Listen to hear the word.

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

carryverbUS /ˈkæri/

move while supporting, either in a vehicle or in one's hands or on one's body

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

CENTREnounUS /ˈsentər/

a low-lying region in central France

From this reading CENTRE OF GRAVITY.

coffinnounUS /ˈkɔːfɪn/

box in which a corpse is buried or cremated

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

consequentlyadverbUS /ˈkɑːnsəkwəntli/

(sentence connectors) because of the reason given

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

consideredadjectiveUS /kənˈsɪdərd/

carefully weighed

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

digverbUS /dɪɡ/

turn up, loosen, or remove earth

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

directlyadverbUS /dərˈektli/

without deviation

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

discoverynounUS /dɪˈskʌvəri/

the act of discovering something

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

doauxiliary verbUS /duː/

used to form questions and negatives, and to give emphasis

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

dueadjectiveUS /duː/

owed and payable immediately or on demand

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

enounUS /iː/

a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

eachdeterminerUS /iːtʃ/

every one of two or more people or things, taken separately

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

earthnounUS /ɜːrθ/

the 3rd planet from the sun; the planet we live on

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

everydeterminerUS /ˈevəri/

all the members of a group, with none left out

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

exactlyadverbUS /ɪɡˈzæktli/

indicating exactness or preciseness

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

fabledadjectiveUS /ˈfeɪbəld/

celebrated in fable or legend

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

factnounUS /fækt/

a piece of information about circumstances that exist or events that have occurred

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

fallverbUS /fɔːl/

descend in free fall under the influence of gravity

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

forcenounUS /fɔːrs/

a powerful effect or influence

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

forcesnounUS /ˈfɔːrsɪz/

plural of “force” — a powerful effect or influence

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

formnounUS /fɔːrm/

the phonological or orthographic sound or appearance of a word that can be used to describe or identify something

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

fromprepositionUS /frʌm/

showing where something starts, or who sent it

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

gallerynounUS /ˈɡæləri/

spectators at a golf or tennis match

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

globenounUS /ɡloʊb/

the 3rd planet from the sun; the planet we live on

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

GRAVITYnounUS /ˈɡrævəti/

(physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface

From this reading CENTRE OF GRAVITY.

ipronounUS /aɪ/

the person speaking or writing, as the subject of the verb

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

ifconjunctionUS /ɪf/

on condition that; in the event that

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

inprepositionUS /ɪn/

inside something, or within a place, period, or state

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

isauxiliary verbUS /ɪz/

the form of “be” used with he, she, it, or a singular noun

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

itpronounUS /ɪt/

a thing, animal, or idea already mentioned

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

Mahomet's

Dictionary entry pending editorial verification. Tap Listen to hear the word.

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

maymodal verbUS /meɪ/

used to say something is possible, or to give permission

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

momentumnounUS /moʊˈmentəm/

an impelling force or strength

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

movingadjectiveUS /ˈmuːvɪŋ/

in motion

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

oblatenounUS /ɑːˈbleɪt/

a lay person dedicated to religious work or the religious life

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

OFprepositionUS /ʌv/

belonging to, or connected with, somebody or something

From this reading CENTRE OF GRAVITY.

onprepositionUS /ɑːn/

touching and supported by a surface

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

orconjunctionUS /ɔːr/

used to join alternatives or possibilities

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

otheradjectiveUS /ˈʌðər/

not the same one or ones already mentioned or implied

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

ourdeterminerUS /ˈaʊər/

belonging to the speaker and others

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

parallelnounUS /ˈperəlel/

something having the property of being analogous to something else

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

partsnounUS /pɑːrts/

the local environment

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

plummetverbUS /ˈplʌmət/

drop sharply

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

plummet-lines

Dictionary entry pending editorial verification. Tap Listen to hear the word.

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

pointnounUS /pɔɪnt/

a geometric element that has position but no extension

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

pointsnounUS /pɔɪnts/

plural of “point” — a geometric element that has position but no extension

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

polenounUS /poʊl/

a long (usually round) rod of wood or metal or plastic

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

possibleadjectiveUS /ˈpɑːsəbəl/

capable of happening or existing

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

ratheradverbUS /ˈræðər/

on the contrary

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

sidenounUS /saɪd/

a place within a region identified relative to a center or reference location

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

situationnounUS /ˌsɪtʃuːˈeɪʃən/

the general state of things; the combination of circumstances at a given time

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

solidadjectiveUS /ˈsɑːləd/

characterized by good substantial quality

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

speakingnounUS /ˈspiːkɪŋ/

the utterance of intelligible speech

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

spherenounUS /sfɪr/

a particular environment or walk of life

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

spheroidnounUS /ˈsfɪrɔɪd/

a shape that is generated by rotating an ellipse around one of its axes

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

stonenounUS /stoʊn/

a lump or mass of hard consolidated mineral matter

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

strictlyadverbUS /ˈstrɪktli/

restricted to something

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

substancenounUS /ˈsʌbstəns/

the real physical matter of which a person or thing consists

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

surfacenounUS /ˈsɜːrfəs/

the outer boundary of an artifact or a material layer constituting or resembling such a boundary

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

suspendedadjectiveUS /səˈspendɪd/

(of undissolved particles in a fluid) supported or kept from sinking or falling by buoyancy and without apparent attachment

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

ThatconjunctionUS /ðæt/

used to introduce what somebody said, thought, or felt

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

thedeterminerUS /ðə/

used before a noun that is already known, already mentioned, or the only one of its kind

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

thenadverbUS /ðen/

subsequently or soon afterward (often used as sentence connectors)

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

thisdeterminerUS /ðɪs/

used for a person or thing that is near, or that has just been mentioned

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

throughprepositionUS /θruː/

from one end or side of something to the other

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

ThusadverbUS /ðʌs/

(used to introduce a logical conclusion) from that fact or reason or as a result

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

toparticleUS /tuː/

used before the base form of a verb to make the infinitive

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

twonounUS /tuː/

the cardinal number that is the sum of one and one or a numeral representing this number

From this reading Thus, if a plummet be suspended on the surface of the earth, it points directly to the centre of gravity, and, consequently, two plummet-lines suspended side by side cannot, strictly speaking, be parallel to each other.

unitedadjectiveUS /juːˈnaɪtɪd/

characterized by unity; being or joined into a single entity

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

wereauxiliary verbUS /wɜːr/

the past form of “be” used with you, we, they, or a plural noun

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

whateverdeterminerUS /ˌwʌˈtevər/

any or all of a kind, it does not matter which

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

whichpronounUS /wɪtʃ/

used to introduce a clause giving more about a thing just mentioned

From this reading _That point about which all the parts of a body do, in any situation, exactly balance each other._ The discovery of this fact is due to Archimedes, and it is a point in every solid body (whatever the form may be) in which the _forces_ of _gravity_ may be considered as _united_.

wholeadjectiveUS /hoʊl/

including all components without exception; being one unit or constituting the full amount or extent or duration; complete

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

willmodal verbUS /wɪl/

used to talk about the future, or about willingness

From this reading In our globe, which is a sphere, or rather an oblate spheroid, the centre of gravity will be the centre.

wouldmodal verbUS /wʊd/

used for something imagined, polite, or habitual in the past

From this reading If it were possible to bore or dig a gallery through the whole substance of the earth from pole to pole, and then to allow a stone or the fabled Mahomet's coffin to fall through it, the momentum--_i.e._, the force of the moving body, would carry it beyond the centre of gravity.

Chapter 5 of The Boy's Playbook of Science by John Henry Pepper holds 90 sentences, grouped into 18 reading sections of at most 5 sentences. The text is the source edition, unabridged, and the chapter records which sentences cover which part of the work so that nothing is dropped. Every word can be tapped for its pronunciation and dictionary entry.

What does chapter 5 of The Boy's Playbook of Science contain?

Chapter 5 holds 90 sentences of The Boy's Playbook of Science, unabridged, divided into 18 reading sections.

This page carries chapter 5 of The Boy's Playbook of Science by John Henry Pepper exactly as it stands in the source edition, without abridgement. It runs to 90 sentences, grouped into 18 sections of at most 5 sentences so that a reader can take the chapter in steady, finishable pieces. The chapter also stores a coverage record mapping every one of its sentences to a part of the work, which is how the edition demonstrates that no line was dropped.

How do I study chapter 5 of The Boy's Playbook of Science?

Work through the 18 sections in order, replaying any sentence and tapping unfamiliar words for their entries.

Each of the 18 sections in this chapter is short enough to read once, hear once, and then re-read with the vocabulary in view. Tapping a word plays it alone and opens its dictionary entry with IPA, part of speech and meaning, so the reader is never forced to guess a pronunciation from spelling. Working section by section keeps a long chapter from becoming an undifferentiated wall of text, which is the usual reason a reader abandons a work of this period.

Can chapter 5 be read aloud to me?

Yes — every sentence and every individual word in chapter 5 can be played aloud in United States English.

Audio covers the whole chapter: any sentence can be played, and any single word within it can be played on its own. The voice uses United States English. For a work of this period that matters, because spelling is an unreliable guide to pronunciation for vocabulary that has fallen out of daily use, and a learner who guesses wrong tends to keep the error. Hearing the word in its own sentence, and then alone, settles it.

Questions about reading The Boy's Playbook of Science

Common questions about reading The Boy's Playbook of Science by John Henry Pepper on this page, its source edition and its audio.

Is this the complete text of The Boy's Playbook of Science?

Yes. All 4206 sentences of Project Gutenberg eBook #41839 are kept, with a record of which sentences cover which part.

Which edition of The Boy's Playbook of Science is used?

Project Gutenberg eBook #41839, unabridged. The Project Gutenberg header, footer and licence are removed.

How long does The Boy's Playbook of Science take to read?

About 350 minutes of reading across 842 sections of 5 sentences each, at an unhurried pace.

How to read The Boy's Playbook of Science section by section

How to work through The Boy's Playbook of Science section by section, using the audio and the tap-to-define vocabulary.

  1. Open a chapter

    Choose one of the 31 chapters of The Boy's Playbook of Science to begin.

  2. Read one section

    Each section holds 5 sentences; read it once through.

  3. Listen and tap

    Play the section aloud, then tap any unfamiliar word for its entry.

Vocabulary met early in The Boy's Playbook of Science

Words and structures a reader meets early in The Boy's Playbook of Science, each tappable for pronunciation and meaning.

Chemical
A word that appears in the opening chapter of The Boy's Playbook of Science; the reader can tap it to hear it and see its dictionary entry.
Philosophical
A word that appears in the opening chapter of The Boy's Playbook of Science; the reader can tap it to hear it and see its dictionary entry.
Apparatus
A word that appears in the opening chapter of The Boy's Playbook of Science; the reader can tap it to hear it and see its dictionary entry.
Required
A word that appears in the opening chapter of The Boy's Playbook of Science; the reader can tap it to hear it and see its dictionary entry.