434

ON LOCKS AND KEYS.

excelled it in point of correct and finished work-manship. It has continued to command a good salefrom the period of its invention to the present time.

Fig. 213.

Mr. Parsons was the inventor of what he callslever-tumblers to padlocks and box-locks, which con-sists in so constructing the lever-tumblers that theirends form the holt which locks into the shackle ofthe padlock, or the link of the box-lock, as shewnin fig. 213.

JIT;:

Fig. 214.

Fig. 214 represents a Parsons’ slip-holt or lever-tumbler lock of this description. This was found