Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 312
e plan LOCKS. 299 is represented in Fig. 2820. Tbis lock was considered secure for several years, when the ingenuityof burglars discovered a method of picking it. Mr. Barron subsequently added another tumbler,which had to be raised to correspond to another set of notches in the bolt, and thereby… … 2821.
Mechanical engineering -- Dictionaries
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