Wireless telegraphy and wireless telephony : an understandable presentation of the science of wireless transmission of intelligence by Ashley Charles Grinnell & American School (Chicago Ill.) & Hayward Charles Brian 1876-

Author:Ashley, Charles Grinnell & American School (Chicago, Ill.) & Hayward, Charles Brian, 1876-
Language: eng
Format: epub
Tags: Telegraph, Wireless, Telephone, Wireless
Publisher: Chicago : American school of correspondence
Published: 1912-03-25T05:00:00+00:00

Dry cells developing an electromotive force, when fresh, of about 1.5 volts are generally used in the local recorder and tapper circuits. One such cell is frequently used in the relay and the coherer circuit.

Measuring Instruments. Perhaps in no department of electro-technics are the quantitative values of the electrical measurements of more vital importance than in the science of radiotelegraphy. A well-equipped station, therefore, possesses efficient instruments for the measurement of the various electrical factors involved. Besides the common appliances of this nature, such as the voltmeter, ammeter, Wheats tone bridge, etc., it is highly advisable to have the requisite means for making accurate determinations of capacity and inductance. Wave-lengths can be measured by wave-meters, or cymometers. These devices are now on the market and are of great utility in a wireless station.

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