Trebel, George. [from old catalog] · New York, F. Tousey · leaf 13
threads fastenedto the cross piece. Now touch the end ball with your lampchimney and each one of the balls in succession, and you willfind that they will repel each other. But if you touch someof them with sealing wax, and some with glass, you will findthat they attract each other. The best way,… … The principal parts belonging to this machine are called thecylinder (A), the frame (B B), the rubber (C) and the conduc-tor (D). For the cylinder (A), take a large, smooth candy jar.and cement a circular piece of quarter inch board over the top,where the lid ought to be. Glue a smaller circular…
Electricity
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