Fig. 2 a view of the back of the chuck.
[Illustration: Fig. 1.]
[Illustration: Fig. 2]
[Illustration: FRONT ELEVATION.]
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[Illustration]
A A. The foundation plate screwing on the plate of the mandrel and
carrying the whole of the other parts of the chuck.
B, C. The two driving wheels giving an independent motion to the chuck.
D. Angular wheel moving freely on the wheel C for the angular
adjustment of the figures.
E. Pinion of any number of teeth fitting on the shaft carrying D and C.
H. Large wheel of 120 teeth, forming the foundation of the second
part, and driven from the pinion E by the wheels F, G, and T.
L. Large wheel of 96 teeth driven by the pinions and wheels U, I,
J, K, and forming the foundation plate of the third part, M, which
carries the nose of the chuck.
N, N. Self-adjusting radius plates for carrying the various change
wheels.
O, P. The eccentric slides of the first and second parts.
Fig. 2 shows the arrangement of the driving wheels and pinions on the
back of the chuck.