Robison's Manual of radio telegraphy and telephony for the use of naval electricians (1918)
Robison, S. S. (Samuel Shelburne), b. 1867, United States Naval Institute, Todd, David Wooster, Hooper, Stanford Caldwell · Annapolis, Md. : The United States Naval Institute · leaf 169
e for use in connection withdetermining longitudes by wireless telegraphy. It is also self-restoring and can therefore be used with a telephone. 164 MANUA]> OF IJAUIO TELKGRAPHY AND TELEPHONY. TESTING BUZZERS. 212. A testing buzzer with its battery of one cell, its condenser andcircuit, is a… … FiG. 94.—Wireless Telegraph Test Buzzer. For Ships. Hi y. Pl^TlNUM CONTACra, [ BUZZER Fig. 95. tiveness and readiness for operation of the detector. A testing buzzeroutfit furnished with the Telefunken sets is shown in fig. 94, the con-nections of that supplied with the l-P-76 receiving sets in…
