The Practical Telephone Handbook and Guide to the Telephonic Exchange

Abstract

DURING the last few years the art of telephony has made gigantic strides and the future of the telephone industry seems very promising. Many engineers first acquired their working knowledge of the subject from the earlier editions of this well-known handbook. It has gradually ircreased in size, although much obsolete and obsolescent matter has been cut out in each edition. In this latest edition the book has been increased by 146 pages and more than 100 illustrations. Although the book is becoming more technical and more mathematical, it can still be recommended for the beginner. The rapid progress of automatic telephony in Great Britain has taken even experts by surprise. A few years ago it used to be urged that its secrecy, which is really one of its greatest advantages, laid it open to the practical joker who could play silly tricks with impunity. In the United States the trouble had proved to be a real one, and special laws were proposed to frighten the jokers. An unscrupulous business man also might cause the line of a rival to test ‘cngaged’ ant times of the day. Luckily these defects have been completely remedied.

The Practical Telephone Handbook and Guide to the Telephonic Exchange.

By Joseph Poole, and others. Seventh edition, thoroughly revised and enlarged. pp xxv + 870. (London: Sir Isaac Pitman and Sons, Ltd., 1927.) 18s. net.