Cylindrical bobbins 1 and 2 (Fig. a) rotate about fixed axes A and B. The ends of flexible link 3 are secured to these bobbins. In Fig. b, flexible link 3 has the ends secured to cylindrical bobbin 4 and conical bobbin 5 which rotate about fixed axes C and D. When bobbin 1 rotates at uniform speed, link 3 is wound on bobbin 1 and unwound from bobbin 2 which also rotates at uniform speed (Fig. a). If bobbin 4 rotates at uniform speed,) conical bobbin 5 rotates at nonuniform (gradually decreasing speed (Fig. b).
$3489$SFL,4L$