PHYSICAL CONSTANTS. Joseph David BY J. D. EVERETT, M.A., D.C.L., F.R.S., F.R.S.E., PROFESSOR OF NATURAL PHILOSOPHY IN QUEEN'S COLLEGE, BELFAST. SECOND EDITION. London: MACMILLAN AND CO., AND NEW YORK. 1886. [The right of translation and reproduction is reserved.] PREFACE TO "ILLUSTRATIONS OF THE C.G.S. SYSTEM OF UNITS," PUBLISHED BY THE THE quantitative study of physics, and especially of the relations between different branches of physics, is every day receiving more attention. To facilitate this study, by exemplifying the use of a system of units fitted for placing such relations in the clearest light, is the main object of the present treatise. A complete account is given of the theory of units ab initio. The Centimetre-Gramme-Second (or C.G.S.) system is then explained; and the remainder of the work is occupied with illustrations of its application to various branches of physics. As a means to this end, the most important experimental data relating to each subject are concisely presented on one uniform scale-a luxury hitherto unknown to the scientific calculator. I am indebted to several friends for assistance in special departments-but especially to Professor Clerk Maxwell and Professor G. C. Foster, who revised the entire manuscript of the work in its original form. Great pains have been taken to make the work correct as a book of reference. Readers who may discover any errors will greatly oblige me by pointing them out. |