Five hundred and seven mechanical movements (1903)
Brown, Henry T. [from old catalog] · New York, Brown & Seward · leaf 69
f ashaft revolving in an ordinary bearing it issometimes supported on the circumference I of wheels. The friction is thus reduced toI the least amount. 251. Releasing-hook, used in pile-drivingmachines. When the weight, W, is suffi-ciently raised, the upper ends of the hooks,A, by which it is… … Mechanical Movements. 65 252. A and B are two rollers which requireto be equally moved to and fro in the slot,C This is accomphshed by moving thepiece, D, with obhque slotted arms, up anddown. 253. Centrifugal check-hooks, for prevent-ing accidents in case of the breakage of ma-chinery which raises…
Mechanical movements
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