Electricity for everybody; its nature and uses explained (1895)
Atkinson, Philip · New York, The Century Co. · leaf 203
uit. The wire in this coil iscorrugated, as shown inFig. 80, t<> prevent theenamel fr<»m being crackedby expan>i<m and contrac-tion of the coil, in heatingand cooling : the differentof expansion by heat, be-tween the enamel and thiswire, being too slight, inthese short… … 188 ELECTRICITY FOR EVERYBODY. which are attached a number of spring-jacks, connectedwith the electric circuit; and by thrusting a plug intoone of these spring-jacks, through a hole in the board,
Electricity
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