Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 228
Fig. 237—Fundamental Circuit of the AudibilityMeter. … Fig. 238—Audibility Meter (American Marconi Company). Shunt resistance boxes are manufactured for this purpose and are termed audibility meters.The resistance coil is fitted with a multipoint switch and the contact studs are calibrated in termsof the audibility of the received signals as compared…
Telegraph, Wireless
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