A treatise upon wireless telegraphy and telephony by Hoppough C. I

Author:Hoppough, C. I
Language: eng
Format: epub, pdf
Tags: Telegraph, Wireless, Radio
Publisher: Valparaiso, Ind., The author

WIRELESS TELEGRAPHY AND TELEPHONY.

strength but less E. M. F. by the spark coil, and produce a movement of the diaphragm of the low resistance telephone T.

Fig. 11.

This arrangement makes one of the most sensitive receivers yet employed in wireless telegraphy. The only objection is the short life of the filament. Dr. Fleming states that owing to the fact that a Tungsten filament is a greater radiator of electrons than carbon the substitution of a Tungsten filament greatly increases the efficiency of the valve as a radiator, besides lengthening the life of the filament.

There are several other forms of apparatus which have been used for wave detectors, but those described here are the types most commonly employed by commercial wireless companies, and no attempt has been made to describe any particular method of construction, as there are several books which have been written upon the construction of amateur wireless equipment. However, the author has found that the best obtainable is always the cheaper in the long run, so would advise the purchase outright of any particular piece of apparatus desired, and of a reliable company, keeping in mind that a cheap instrument will never give a real test of that particular type's efficiency.

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