410

ON LOCKS AND KEYS.

of which are large enough for the nuts j to projectthrough; over this is lastly put on the notched platee, which fits on the axis g, and is screwed tightagainst the nut j by the screw m, which enters theend of the axis g. In fig. 190 the screws are re-moved to shew the plates e e and the end of axisg. Now in order to prevent each of these platesfrom turning without its axis s, there are ten holesround the centre hole, shewn in fig. 196, and a pink, fig. 193, is fixed on one side of the top of thenut j, which enters one of these holes and secures

Fig. 194.

Fig. 193.

it. Fig. 197 shows the middle toothed wheel andnotched plate/’ with the axis o separate; they areall screwed together by the side screw. Fig. 198shows the front of the axis, with the notch to receive

Fig. 195.

the projection n of the key, fig. 199. o. fig. 197is the end which enters the key. Having describedthe wheels and their axis, it remains to describe thegovernor or secret guide plate, which, with the key,