Excerpt from Telephony: Including Special Articles
The rapid development of Telephone Engineering within the last few years has created a demand in this field for trained men, whose education and knowledge of the subject must be no less complete than that required by the so-called "heavy-current" engineers. It is becoming realized that the problems presented in the installation, operation and maintenance of a large telephone exchange lend themselves to scientific investigation, and that progress is much more rapid from this standpoint than by means of the empirical and haphazard methods in use a few years ago.
In view of these facts and because of the ever increasing importance of the telephone in business and social life this volume has been prepared. It is made up of the Instruction Papers in the Telephone Course of the American School of Correspondence, covering the subjects of telephone instruments, pole line construction, the common battery system, intercommunicating sets, telephone exchanges, operation, maintenance, and private branch exchanges. A valuable feature of this work is the clear and complete discussion of the methods of testing for and locating faults in all parts of the system, together with a description of the instruments used in such work. The above mentioned text is supplemented by timely articles on such subjects as wireless telephony, the automatic telephone, and telephone line protection.
A characteristic of the entire work is its thoroughly practical nature and the illustration of all principles explained, by means of diagrams and circuits.
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