Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . 302 pose of the invention is to guard against a lock-out by the forgetting of a combination. Each of thetwo dials being set by different persons on a different combination, the lock can be opened by eitherperson in the event of the ethers forgetting his combination or being absent. Another feature ofthis lock consists in the outside spindles. It will be noticed that the spindles connected with thedials are placed entirely outside of the lock (their motion being transmitted to t
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . 302 pose of the invention is to guard against a lock-out by the forgetting of a combination. Each of thetwo dials being set by different persons on a different combination, the lock can be opened by eitherperson in the event of the ethers forgetting his combination or being absent. Another feature ofthis lock consists in the outside spindles. It will be noticed that the spindles connected with thedials are placed entirely outside of the lock (their motion being transmitted to the tumblers by a train of gears), and it thus followsthat, in the event of the displacementof the spindles by violence, the lockstill remains intact, and guards thedoor. The spindles arc made of hard-ened steel, to resist drilling, and areshouldered within the door so as toresist an attempt either to drive in orpull out. The Yale Time-Loek is representedin Fig. 2838. The operation of thislock may be briefly explained as fol-lows : Its function being to dog or ob-struct the motion of the heavy bolt-work or gang-holts
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