Chicago : [Popular Engineering Pub. Co.] · leaf 649
61 POPULAR ELECTRICITY … Of the other parts, (F) and (F') are two TROLLEY AND TRACK OF MODEL RAILWAY holed rubber stoppers, (G) and (G') are two bent glass tubes which are connected to (C) speed of about 400 feet per minute. The and (C) respectively by the rubber tubes (H ) system includes about 50 feet of track, one and…
Electricity
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