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These blades are curved and are geared together by means of differential spur wheels, with the object of running the two spindles at unequal speeds.

Then the tooth curves may be drawn on these three arcs, k, l, m, in the same as if they were for a spur wheel.

In the latter case, the small one is the pinion, and the larger one the spur wheel.

A. This can be done in this way: attach a spur wheel to the back of the face plate.

A bevel wheel should be cut in the same manner as the spur wheel, but the cut should be deeper on the side which has the larger diameter.