Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 493
the hole in thecrosspiece. A sheet of aluminium such as is usedfor name-plates is just the thing. Now on thepropeller-wire or -shaft string a smooth, symmet-rical glass bead, and pass the shaft through themetal strip and the crosspiece. This will give youan excellent substitute for ball-bearings.… … DETAIL OF A 1ROPKLLER-SHAFT WORTH INSTALLING.(SEE MODEL ABOVE.) The simplest and most effective motor is formedby connecting the two hooks with many turns ofa long, thin strand of rubber, which can be boughtby the yard or pound. The thinner strands ofrubber will exert more force than the…
Children's literature
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