[414]. Trammel gear; one revolution of the wheel to two double strokes of piston.
[415]. Segmental vanes (in a semicircular case), driven by a disc crank and pin, running on the upper centre, giving motion by links to two arms fixed to the two vanes, which have independent motion. Used as a pumping or blowing machine.
[416]. Circular into reciprocating motion by revolving arm A carrying the two pinions, the point at end of arm B describes a vertical line four times the length of arm B, the large wheel C is fixed, and motion is given to the arm B. May be used as a piston rod and crank motion.
[417]. Trammel gear; the slotted cross moves in a right line.
[418]. Slot link and treadle, driving the pinion on both strokes by friction on the inside of link alternately at the upper and under sides.
[419]. Chain and roller treadle motion.
[420]. Reciprocating wheel and crank motion.
[421]. Velocipede pattern foot treadle.
[422]. Double crossheads, separated by distance rods so arranged as to allow the crank and connecting rod to work between them. See [No. 681].
[423]. Mangle rack and pinion reciprocating gear. The rack moves in a right line, the pinion working round it by moving up and down the slot at each end of the travel of the rack.