Excerpt from Telegraph Engineering: A Manual for Practicing Telegraph Engineers and Engineering Students
This book is intended for electrical engineering students and as a reference book for practicing telegraph and telephone engineers and for others engaged in the arts of electrical communication. It presents in a logical manner the subject of modern overland and submarine telegraphy from an engineering viewpoint, its theoretical and practical aspects being correlated. No attempt is made to describe all telegraphic devices and to explain their operation, but rather to consider one or more representative types for the accomplishment of the various desired objects, thus permitting a presentation of the subject matter in proper perspective. The book is the outgrowth of the course in Telegraph Engineering given by the author for a number of years at the Polytechnic Institute of Brooklyn.
A knowledge of elementary electricity and magnetism is presupposed. For understanding the mathematical demonstrations a knowledge of algebra will in many cases suffice, but in other cases, appearing toward the latter part of the book, the calculus is a necessary adjunct, the study of which frequently precedes or accompanies the vocational studies of students and progressive telegraph workers. That the use of higher mathematics is important in the thorough pursuit of telegraph and telephone transmission studies is evident from an inspection of the writings of Lord Kelvin, Heaviside, Kennelly, Pupin, Campbell, Malcolm and others.
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