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 25
en falls and jerks np the hook-lock, M. which unlocks the door, and the heavier weight, \. Immediately opens jt. Thus with a BWitcb as in Fig. 3. the door can only be opened by the person who has winds the apparatus up again.—Contributedby E. H. Klipstein, 116 Prospect Bt, I i-tOrange, New Jersey.… … Simple BtoCtrk Lock locks lo unlock, push the button, D, whichact will cause the electro-magnet to raise the latch. (. When the holt may be drawn and the door opened Contributed by a D.Zimmerman, Doody, ill. POPULAR MECHANICS
Handicraft · Amusements
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