Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 66
ic hold down ,. r, o nn The hard rubber eccentric is held by a friction spring washer. Varyingthe handle permits permanent closure of the circuit or the use of the keyas a plain single, contact key; or, throwing lever clear back instantlythrows the upper—galvanometer short-circuit key —contact in…
Electric apparatus and appliances · Equipment and supplies
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