Amateur mechanics ... a book for old and young who like to make things .. (1907)
Popular mechanics magazine, Chicago. [from old catalog] · Chicago, Popular mechanics · leaf 36
Electrical Attachment for Discharging Toy Cannon than the ordinary cannon which is firedby means of a fuse.—Contributed by HenryPeck, Big Rapids, Mich. EXPERIMENT WITH TWO=FOOTRULE AND HAMMER An example of unstable equilibrium isshown in the accompanying sketch. Allthat is needed is a two-foot… … Equilibrium Experiment With Hammer and Rule ing a loop, and pass around the hammerhandle and rule. Then place the apparatuson the edge of the table, where it will re-main suspended as shown in the sketch.—Contributed by Geo. P. Schmidt, Culebra,Porto Rico, W. I. POPULAR MECHANICS HOW TO MAKE A…
Handicraft · Amusements
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