American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 440
d. No secondarycoil is used in this case,the impulses in the coilsof M caused by the varia-tions of the resistance inthe telephone transmitter(due to the voice) suf-ficing. Jhe condenser cis employed for the pur-pose already mentioned.The transmitter is con-nected to posts 6 and 7;the receiver to… … ih m FIG. 2J()d. on this apparatus is of the open-circuit tvpe, switch D should always be kept openwhen the apparatus is idle. Jlie switches should always be set for Morse or buzzerworking when not being used for telephone working. When it is desired to use aregular Morse system and the buzzer on…
Telegraph
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