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NATURAL PHILOSOPHY

THOMSON AND TAIT

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8550

ELEMENTS

OF

NATURAL PHILOSOPHY

BY

liam ist baron Kelvin
PROFESSORS SIR W: THOMSON AND P. G. Tait

PART I

Orford

AT THE CLARENDON PRESS

1873

[All rights reserved]
17:..

PREFACE.

The following work consists, in great part, of the largetype, or non-mathematical, portion of our Treatise on Natural Philosophy.

As it is designed more especially for use in Schools and in the junior classes in Universities, the mathematical methods employed are, almost without exception, limited to those of the most elementary geometry, algebra, and trigonometry. Where higher methods are required for an investigation, the reader is, in general, simply referred to our larger work.

It is particularly interesting to note how many theorems, even among those not ordinarily attacked without the help of the Differential Calculus, have here been found to yield easily to geometrical methods of the most elementary character.

Simplification of modes of proof is not merely an indication of advance in our knowledge of a subject, but is also the surest guarantee of readiness for farther progress. .

A large part of Chapter VII is reprinted from a series of notes of a part of the Glasgow course, drawn up for Sir W. Thomson by John Ferguson, Esq., and printed for the use of his students.

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