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
bymeans of a piece ofstring which con-nects the two. Whenthe alarm goes offthe trigger dropsand allows the doorto open, thus dis-charging the con-tents of the hopper. After the device has been in operation forsome time the hens will run to the feederwhenever the bell rings.—Contributed by Dr.H. A.… … A device for discharging a toy cannon byelectricity can be easily made by using threeor four dry batteries, a switch and a smallinduction coil capable of giving an %-in.spark. Fasten a piece of wood, A, to thecannon, by means of machine screws or,if there are no trunnions on the cannon, thewood can…
Handicraft · Amusements
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