## Elements of Natural Philosophy |

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Page 17

We can calculate from astronomical data for any instant athe direction in which ,

and the velocity with which , we are moving on account of the earth's diurnal

earth in ...

We can calculate from astronomical data for any instant athe direction in which ,

and the velocity with which , we are moving on account of the earth's diurnal

**rotation**. We may compound this with the ( equally calculable ) velocity of theearth in ...

Page 21

... in a circle works in a straight slot belonging to a body which can only move in a

straight line , fulfil strictly the definition of a simple harmonic motion in the part of

which the motion is rectilineal , if the motion of the

... in a circle works in a straight slot belonging to a body which can only move in a

straight line , fulfil strictly the definition of a simple harmonic motion in the part of

which the motion is rectilineal , if the motion of the

**rotating**part is uniform . Page 29

This is intimately connected with the explanation of two sets of important

phenomena , —the

certain fluids on the one hand , and by transparent bodies under magnetic forces

on the ...

This is intimately connected with the explanation of two sets of important

phenomena , —the

**rotation**of the plane of polarization of light , by quartz andcertain fluids on the one hand , and by transparent bodies under magnetic forces

on the ...

Page 30

... from any one position to any other by

held fixed . To prove this , let A , B be any two points of the plane figure in a first

position , A ' , B ' the position of the same two after a displacement . The lines AA '

...

... from any one position to any other by

**rotation**in its own plane about one pointheld fixed . To prove this , let A , B be any two points of the plane figure in a first

position , A ' , B ' the position of the same two after a displacement . The lines AA '

...

Page 31

BA will pass to its next position by

method of § 91 by drawing perpendiculars to OX and Oß at A and B В B. Hence P

for thë instant revolves about l , and thus its direction of motion , or the tangent to

the ...

BA will pass to its next position by

**rotating**about the point Q ; found by themethod of § 91 by drawing perpendiculars to OX and Oß at A and B В B. Hence P

for thë instant revolves about l , and thus its direction of motion , or the tangent to

the ...

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acceleration according acting action amount angle angular applied attraction axes axis body called centre centre of inertia circle component condition consider constant corresponding couple course curvature curve denote density described determined direction displacement distance divided effect elastic elements energy equal equations equilibrium expression figure fixed fluid force friction give given gravity harmonic Hence increase infinitely small instant interval kinetic length less mass matter mean measured method motion moving natural normal observation opposite parallel particle passing path period perpendicular plane portion position potential practical pressure principle produce projection proportional quantity radius reference relative remain remarkable resistance respectively rest resultant right angles rigid rotation round sides simple solid space spherical square straight strain stress suppose surface theory turned uniform unit velocity vertical weight whole wire