American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 86
ugh the base, and is insulated from it by a bushing of hard rubber.On its top it is furnished with a cone-shaped cap c, termed the anvil, carrying a smallplatinum point. A small flat strip of metal, s, extends out a short distance from thecap. At a point on its under side, directly above the… … BUNNELL KEY. M, tci\yQed the circuit closer, is pivoted on the base, as shown. The lever a, andthe circuit closer m, are each supplied with hard-rubber finger-tips, or knobs, by whichthey laay be freely moved. A spring, adjustable by the set screw f, normally liftsthe lever a from the contact point…
Telegraph
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