610

OK LOCKS AND KEYS.

single set of slides or levers, as shewn in sheet No.2, figs. 6, 7, and 8, or any modification of the samefor the purposes before named.

Mr. Hobbs is also the inventor of a “ flush-boltportable or camp-desk lock.” The specificationstates in reference thereto that—“ The advantagesof this lock over those in general use are these—that the bolt descends flush with the selvage whenthe lock is unlocked; and when in the act of lock-ing first ascends vertically from out of the selvage,until it arrives at the proper height of the link,then, with an horizontal motion, slides under thelink, as in the ordinary method of the commonlink-plate lock.”

The movement in this latter lock is precisely thesame as that in Perry’s, described at page 459.Numerous efforts have been made to construct asimple flush-bolt lock , and the most successful of anywe have seen is one to be described hereafter, andis the invention of Mr. Aubin—Nettle fold’s patentof 1855.

Tucker’s Closed-Keyhole Detector Lock, Patent datedOctober 1st, 1852.

The separating-key lock of this inventor (pre-viously described) being found to be objectionable,from the possibility of the accidental severance andconsequent loss of the key-bit, the present lock wasproduced as possessing equal advantages in pointof security, while at any rate free from that special