Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 105
SOUNDWAVES … SOUND WAVBFAILING OBLIQUELY on TRANSMITTER Fig. 3,046.—Acousticon transmitter. This is one of the most sensitive transmitters made andis so arranged that all sound waves are concentrated directly upon the diaphragm. It isthis type of transmitter which is used on the dictograph instruments. Fig.…
Electrical engineering
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