Chapter CXXI: Section 40: Gearing, Various Devices in

(_See also p. 92._)

=2194. Turn-over gear= for reversing a stamp, table or platen by rack and pinion.

=2195. Double driving motion= by belt for two saws, cutters, drills, &c., so that either may be put in work at various points in a half circle of the radius of the arm.

=2196. Sun and planet gear.= ~A~ is a fixed wheel, ~B~ is keyed to the barrel shaft, ~C~ and ~D~ are cast together and run loose on a stud on the crank arm.

=2197. Two-tooth pinion gear.=

=2198. Cam spur gear,= to give similar variable movements to those given by cams.

=2199. Motion to vary the angle of a screw propeller= blade, a windmill, feathering wheel, &c., by bevel gear and a central shaft.