The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

For variable speed and power by belt gear, see [Section 3].

[1582]. Variable speed belt cones, for crossed belts. Angle of cones should not exceed 15°.

[1583]. Stepped cone gear.

[1584]. Variable throw crank pin. (See Hastie’s Patent, 3561, 1878; Knowelden and Edwards’, 2996, 1858.)

[1585]. Beam motion, with variable fulcrum to alter the proportionate lengths of stroke of driving and driven cylinders. See also [No. 1606].

[1586]. Variable pressure accumulator. Both cylinders are in communication by a pipe, and the pressure varies with the angle between the rams.

[1587]. Wright’s variable gear. The radius of frictional contact of the wheels varies as they are moved closer together or separated.

[1588]. Olmsted’s variable cone friction gear, with intermediate double cone idle wheel instead of belt.

[1589]. Convex and concave cones for open belts.

[1590]. Three speed gear, each separate pair of spur gear being driven by its own belt pulley on separate sleeve pieces.