Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 122
Fig. 86. Tumbler Lock. 91 84 BUILDING SUPERINTENDENCE … Fig. 87. Cylinder Lock. Bolts. Of greater protection than locks on a door are bolts,which, being operated from one side only, are secure against picking.The simplest and least noticeable of these are the mortise boltswhich set into a hole bored in the edge of the door and are operated by a knob or…
Architecture · Building
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