by the dotted line), pivoted at the angle on a pin. From the face of the tumbler a stud, S, projects through the hole in the bolt. This stud is forced into one or other of the notches by the spring, S1, which presses on the tail of the tumbler.
In Fig. 213 the key is about to actuate the locking mechanism. The next diagram (Fig. 214) shows how the key,