Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 448
the E.M.F. being strong, applies the brakevery hard. As the current In the armature, owing to the slowingdown of the motor on the application of the brake, becomes weakerthe pressure on the brake becomes less, until finally it ceases en-tirely, and at this point the other mechanical brake operated… … Fig. 20. Mechanical CoutroUer, Vai-iableSpeed. 347 34 ELEVATORS the other solenoid releases its hold on the brake and allows thespring to apply it. This latter arrangement, however, of using the E.M.F. to ap-ply the brake, is simply a roundabout way of reaching the result—partly by mechanical and…
Architecture · Building · Carpentry
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
