The Project Gutenberg EBook of The Telephone, by A. E. Dolbear

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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 ***

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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