Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 986
he wedge tighteragainst the guide, but producing an additional retardingforce. When a car is caught by the safety, all that is neces- Hydraulic Elevators 951 sary to release it is to start in the upward direction, and theforce exerted by the lifting cylinder is enough to overcomethe friction of the… … Fig. 392 a very high velocity when the ropes do not break, and onthat account it is necessary to arrange the safety so thatit will act when the speed reaches a certain stage regard-less of the cause of increased velocity. This is accom-plished by means of the Otis safety governor, shownmounted on…
