A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . ce thesame principle of security against picking, while avoiding the complexity of the change-able lock. The distinction which Mr. Ilobbs has made between secure and insecure lockswill be understood from tlie following proposition, viz. that whenever the parts of a lockwhich come in cont^^Jt with the key are so affected by any pressure applied to the bolt, orto that portion of the lock by which the bolt is withdrawn, as to indicate the points of re-sistance to t
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . ce thesame principle of security against picking, while avoiding the complexity of the change-able lock. The distinction which Mr. Ilobbs has made between secure and insecure lockswill be understood from tlie following proposition, viz. that whenever the parts of a lockwhich come in cont^^Jt with the key are so affected by any pressure applied to the bolt, orto that portion of the lock by which the bolt is withdrawn, as to indicate the points of re-sistance to the withdrawal of the l)olt, such a lock can be picked. Fir/. 417 exhibits theinternal mechanism of this new patent lock. It contains the usual contrivances of tumblersand springs, with a key cut into steps to suit the different heights to which the tumblersmust be raised. The key is shown separately injlr/. 418. But tliere is a small additionalpiece of mechanism, in which the tumbler stump shown at s in 416 and 417 is attached;which piece is intended to work under or behind the bolt of the lock. Injif/. 417 6 is the 417. 416
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
