Builder's hardware; a manual for architects, builders and house furnishers . rills Lock. groove on the disk, permitting the whole to be the key is withdrawn the slides are forced in differentdegrees towards the centre, so that the solid portions interceptthe groove in the disk, in which position it is held fast by the LOCKS. 185 fixed ring. It is believed that this lock never has been lock which in its time was a strong competitor Avith the Bramah and Cotterills locks, and was equally im-pregnable, is Day & Newells Perautopic bank-lock, anAmerican invention which was in
Builder's hardware; a manual for architects, builders and house furnishers . rills Lock. groove on the disk, permitting the whole to be the key is withdrawn the slides are forced in differentdegrees towards the centre, so that the solid portions interceptthe groove in the disk, in which position it is held fast by the LOCKS. 185 fixed ring. It is believed that this lock never has been lock which in its time was a strong competitor Avith the Bramah and Cotterills locks, and was equally im-pregnable, is Day & Newells Perautopic bank-lock, anAmerican invention which was in great demand at one time,but has long since ceased to be manufactured. It has thecurious property that the key, which is made with movable bits,can be changed at will, so that the lock can be opened only bythe key which was last used to shoot the bolt. The lock hasnever been picked. Figure 29G, which is taken from Price,is too complicated to fully illustrate the workings. Figure296b, while not exactly like the lock, embodies the same Chapter XI. Day & Fig. 296. Perautopic Lock, open. arrangement and will serve to make the construction under-stood. The letters refer to both figures. There are three dis-tinct sets of levers, A, B and C, each admitting of a sliding orlifting motion up and down, the levers A having springs whichkeep them pressed down, D, and the levers C being constantlyforced up by a spring of lesser strength E, so that the levers Owill always move up and down exactly as A are raised orlowered, the tops of C bearing against the bottom of exten-sions to A. The levers B have no springs, and slide up anddown between studs attached to a wing of the bolt-tail, so that 180 BUILDERS HARDWARE. Chapter XI. when the bolt is shot, the levers B move with it. F is a dogor lever, which is hinged to a stud on the bolt at the top, ai_dhinged with a bent elbow attached to the lock-case at thebottom. On this dog, F, is a tooth, and on the edge of eachof the tumblers B
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