Chapter CVII: Section 21: Circular and Reciprocating Motion

(_See also p. 56._)

=2022. The “Dake” square piston engine;= has a reciprocating double piston and a transverse sliding block, by which rotary motion is communicated to the crank pin.

=2023. Chapman’s patent crank motion.= In this gear the cylinders are fixed at right angles and their strokes are four times the radius of the crank, which is coupled by a link with equal arms (of the same radius as the crank) to the two crossheads direct.

=2024. Crank motion.= The crank pin runs in a sleeve having a sliding motion along the lever.

=2025. Crank motion= (in plan), with side connecting rod and off guide. The crank shaft crosses the piston rod as near as may be.

=2026. Crank motion,= with semi-yoke crosshead.

=2027. Crank motion,= with yoke connecting rod.

=2028. Crank motion,= for a pump, the handle describes an elliptic path.

=2029. Bouchet’s crank motion= to avoid dead centres.

=2030. Eccentric hand crank motion.= The connecting rod has a ring-shaped end, and the strap is revolved on the centre pin by a handle fixed to it.

=2031. Crank motion= to work a sliding tool or movement on a bar or guide.

=2032. Offset crosshead and guide crank motion= for a pump or air compressor.

=2033. Crank motion= to drive a swing arm, or _vice versâ_.

=2034. Side crank motion.=

=2035. Atkinson’s crank motion= to drive the flywheel two revolutions to one double stroke of the piston.