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The Project Gutenberg EBook of The Telephone, by A. E. Dolbear This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org Title: The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action Author: A. E. Dolbear Release Date: July 14, 2010 [EBook #33154] Language: English Character set encoding: ASCII *** START OF THIS PROJECT GUTENBERG EBOOK THE TELEPHONE *** Produced by Emmy, Darleen Dove and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) THE TELEPHONE By Professor A. E. Dolbear _THE TELEPHONE_ With directions for making a Speaking Telephone Illustrated 50 cents _THE ART OF PROJECTING_ A Manual of Experimentation in Physics, Chemistry, and Natural History, with the Porte Lumiere and Magic Lantern New Edition Revised Illustrated $2.00 _MATTER, ETHER, AND MOTION_ The Factors and Relations of Physical Science Illustrated $1.75 Lee and Shepard Publishers Boston THE TELEPHONE: AN ACCOUNT OF THE _Phenomena of Electricity, Magnetism, and Sound,_ AS INVOLVED IN ITS ACTION. WITH DIRECTIONS FOR MAKING A SPEAKING TELEPHONE. BY PROF. A. E. DOLBEAR, TUFTS COLLEGE, AUTHOR OF "THE ART OF PROJECTING," ETC. BOSTON: LEE & SHEPARD, PUBLISHERS. COPYRIGHT, 1877, BY A. E. DOLBEAR. PREFACE. THE popular exhibitions of the speaking-telephone during the past six months, together with numerous newspaper articles, have created a widespread interest in the instrument; and it has been thought that a small book explanatory of its action would meet a public want. It has seemed to be necessary to call attention to the various phenomena and inter-actions of the forces involved; and hence the author has attempted to make plain and intelligible the phenomena of electricity, magnetism, and sound. Cuts have been inserted where they could be useful in making the mechanical conditions more intelligible; and a table of tone-composition has been devised, which shows at a glance the constituents of the sounds of vari
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