American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 523
t is only a question of arranging the necessary combination of feed- and punch-magnets to adapt the keyboard to any dot-and-dash alphabet. Fig. 325a repre-sents a keyboard perforator arranged for the Morse alphabet and numerals, in whichcase no indicator is necessary. Details of Eeceivixg-Circuits… … BUCKINGHAM PERFORATOR. 436>^ the circuits are shown as having ground returns, the negative pole of the dynamobeing indicated by the minus mark and the conventional symbol of an earth con-nection. In fact, metallic circuits are employed. M L is the main-line polarizedrelay. Its armature controls…
Telegraph
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