Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 299
operation of the set, but in orderto be able to send alternating current for balancing purposes another addition must bemade. When we wished to send alternating current with the four channel set it wasnecessary only to move the sending plug to the balancing block and close the pole-changerkey… … I* v y m V V V SV V V V ^ V V V V V V v V V V V |il i§i A^^^^A^^^^^^^^^^^^Vll^^^^^^^l^i^l!iil la*
Telegraph
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