[2512]. Variable drive by an intermediate friction wheel, and two friction cones at right angles.

[2513]. The same device applied to two discs running in opposite directions on the same axis.

[Larger plate.]

[2514]. Variable drive by a V belt running between cone discs, the space between which can be varied by a hand lever or screw motion.

[2515]. Variable compensation weight and parallel motion for steam engines, by M. N. Forney, New York, 1893.

[2516]. Variable cone driving. Evans’ variable friction gear; a loose leather band, with a traversing motion by hand screw, forms the gripping medium between the cones.

[2517]. Variable radius lever, operated by a crank motion to give variable angular reciprocating motion to a shaft.

[2518]. Variable crank pin adjusted by a sector and bolt.

[2519]. Variable crank pin adjusted by a transverse screw.