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PREFACE.

In the following descriptive series the writer does not purpose setting down original ideas on the above subject, but aims rather at a compilation of the most useful electrical tests and the manner in which they may be practically conducted, together with a summary description of the principal apparatus involved, on the lines of such a popular work as Kempe's "Handbook of Electrical Testing; " but, contrary to the general rule in the above and similar text-books, eschewing all mention of the theory underlying the various processes therein described, which, although a necessary adjunct to the training of the electrical engineer proper, is, nevertheless, somewhat of a hindrance when prompt reference to the manner of conducting a certain test is necessary.

For theoretical considerations on the following paragraphs the reader is therefore referred to Kempe's "Handbook" and kindred works. The diagrams and blocks illustrating the text have, in all cases, been rendered in as clear and comprehensive a form as possible, the usual symbols being employed to represent batteries, keys, etc., a rudimentary knowledge of electrical principles being necessarily assumed on the part of the reader.

The author begs to tender his sincere thanks to Messrs. Nalder Bros., Elliott Bros., J. Pitkin, R. Paul, Evershed and Vignoles, Cowans, the India Rubber, Gutta Percha, and Telegraph Works Company, and James White, for the loan of the major portion of the blocks illustrating the pages to follow. His thanks are also due to the publishers 98889