Electricity for everybody; its nature and uses explained (1895)
Atkinson, Philip · New York, The Century Co. · leaf 236
er; and enough space is allowed oneach side of it, to prevent contact either with the magnet-pole or the mouth-piece; the width of the space next thepole being so adjusted by the screw at S, as to prod neethe proper magnetic attraction. The Blake Transmitter,—The Blake transmitter,illustrated by… … THE TELEGRAPH AND TELEPHONE. 221
Electricity
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