Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 124
soft ironsurrounded bya coil of silk-covered wire, ^S- 26.with an outer covering of india-rubber, or some othersubstance, to protect it from injury. The ends of thiscoil are connected through a pair of terminals attachedto a wooden base—one only of which is shown in thediagram—to the line-wire and… … 112 ELE CTRICIT Y IN MODERN LIFE. against the stops by means of the spring s, the tension ofwhich may be varied at pleasure, according to the strengthof the current in the line-wire, by means of the adjustingscrew shown in the diagram. When the circuit is closed, bymeans of a key at the…
Electric industries · Electricity
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