_Tab. 28._ The elevation of the whole machine, the lever B (_Tab. 27._)
working the wheel A (_Tab. 26_).
_s_ (_Tab. 26._) a thin piece of metal screwed to the wheel A, to
keep it in its place _t_ on the arbor K (_Tab. 27._)
_u_ (_Tab. 26._) the cock, that fastens the pinion G, to the inside
of the wheel A.
_w_ (_Tab. 26._) the cock, that fastens the pinion H on the outside
of the wheel A.
_x_ (_Tab. 27._) the arbor, on which the pinions G and H are fixed.
_y_ (_Tab. 26._) a spring, that keeps the click _a_ in its place.