Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 143
e. … ONE OF THE COILS FRONT VIEW MOUTHPIECE REMOVED VERTICAL SECTIONTHROUGH CASE with flat heads. They can be purchased at a hardware store.The screws should be covered with a layer of stout paper, gluedon, and then two circular wooden discs are slipped on eachscrew, whose outside diameter is $i inch.…
Electric apparatus and appliances · Electricity
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