Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 455
Safety Plank ^ rioor of Cage \ ■Shaft which reyo/i^es thesaferc/ dogs … Fig. 25. Arrangement for Throwing Safety Dogs. so adjusted that the normal speed of the elevator does not affecteither them or the dogs, but should the speed of the elevator ex-ceed the normal by about 25 per cent, the centrifugal force exertedby these dogs, which are weighted somewhat, will…
Architecture · Building · Carpentry
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
