Excerpt from The Theory and Practice of Absolute Measurements in Electricity and Magnetism, Vol. 1 of 2

The present work is an extension of my small book which, published in 1884, has long been out of print. When the question of the issue of a second edition arose about three years ago, it was thought desirable to extend the plan of the former book so as to make the new a fairly complete treatise on the absolute measurement of electric and magnetic quantities. It has not been my aim to processes or a collection of practical rules, but one in which should be welded together, in some degree at least, the practice of absolute measurements and the mathematical theory of electric and magnetic phenomena.

Thus it was no part of my plan to deal with the more recondite and abstract parts of electrical theory; but I trust the work now published may prove of some help to students who may wish to proceed to those subjects. I have, notably in Chapter I. of the present volume, included here and there for the sake of illustration particular theoretical cases which have no direct bearing on experimental processes.

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