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LONG MANS, GREEN, AND CO.
39 PATERNOSTER ROW, LONDON

NEW YORK AND BOMBAY

1904

All rights reserved

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First printed January 1885 ; Reprinted May 1886, December 1888.

Revised Edition February 1893 ; Reprinted April 1894, January 1899, November 1900, January 1902, and January 1904.

PREFACE

TO

THE

FOURTH EDITION.

The issue of a new edition affords us the opportunity of making some alterations and additions which the experience of ourselves or our successors at the Cavendish Laboratory has shewn to be desirable.

The development of physical science on the lines indicated by the principle of the conservation of energy has made more conspicuous the importance of experimental Dynamics as the basis of experimental physics, so that some considerable space has been given to that branch of the subject, and a good deal of attention has been devoted to the geometrical representation of rates of variation, especially as illustrating the determination of the velocity and acceleration of a body the position of which is known foi successive instants of time. Geometrical representation has, indeed, been kept in view throughout.

The advances that have been made in the sciences of magnetism and electro-magnetism have also necessitated some considerable additions. The chapter on magnetism

has been enlarged, and a chapter on electro-magnetic induction has been added.

It has been thought better not to disturb the numbering of the sections, and the new sections have therefore been separately numbered A-Z and I to 0.

In the preparation of this edition we are greatly indebted both to Mr. H. F. Newall, who was demonstrator when the apparatus for many of the new sections was first set up, and also especially to Mr. G. F. C. Searle, of Peterhouse, upon whose version of the Laboratory MSS. the text of many of the new sections depends. Mr. Searle, besides contributing the section on the dynamical equivalent of heat, has also been good enough to revise the whole of the proof sheets and to give us the advantage of his experience in the Laboratory by making numerous valuable suggestions.

Many of the original drawings for the figures were made for us by Mr. Hayles, the Lecture Assistant at the Laboratory

R. T. GLAZEBROOK
W. N. SHAW.

January 6, 1893

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