Plate 3 is connected by turning pair C to connecting rod 2 of slider-crank linkage ABC. Plate 3 is connected by turning pairs D and E to two gears, 5 and 4, of equal diameter. Gears 4 and 5 mesh with sliding gear rack 6 and with fixed gear rack 7. The length of the stroke of the upper rack is twice that of the centres of the gears. This relationship holds for any diameter of gears 4 and 5.
$1746$GL,ML$