Locks and Safes. The construction of locks; compiled from the papers of A. C. Hobbs, ... and edited by C. Tomlinson. ... To which is added a description of ... J. B. Fenby's patent locks, and a note upon iron safes. By R. Mallet |
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action allow American applied arrangement attached attempt barrel bolt Bramah brought called centre Chubb closed combination committee completely consists construction contrivance curtain cylinder described door effect employed Exhibition false fixed force further give given groove hand height held Hobbs hole Illustrated impression improvement inserted Institute invention iron key-hole kind known length letter levers lifted London machine manufacture means mechanism Messrs metal motion move Newell notches notice object open the lock operator original pass patent person picking pieces plate position possible pressed pressure prevent principle produce projecting proper raised receive reference remarkable removed render respect ring round safe screw separate shew shewn shown side slides slot spring steel steps stud stump sufficient taken trial true tumblers turned unlocked wards