American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 517
o indicates the actual type of crank-lever operated by the piano-wire.For simplicity the remainder of the crank-levers are represented as at 0 0. Tlieyare pivoted as shown at ^ ^ on the same metallic base m. Their lower contact pointsare indicated by I. The 16 punch-magnets are represented by… … BUCKINGHAM KEYBOARD PERFORATOR. way shortly to be explained, i is a magnet termed the knock-down magnet, theuse of which will be described in connection with the paper feed-wheel of the per-forator. It is controlled by the circuit-closer ^^, which is carried on the armature-lever of an…
Telegraph
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