The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

Section 22.—CONCENTRATED POWER.

Multiplication of power by great reduction of speed is accomplished by the following devices, and various obvious modifications of them. Ordinary methods comprise—Gearing (see [Section 84]), the screw or compound screws (see [Section 78]), and the wedge and lever (see [Section 53]). By differential screws, [Nos. 1379], [1380].

[437]. Compound lever.

[438]. Double toothed-cam and lever combination.

[439]. Double lever and link motion, with increasing pressure. The strains are self-contained, and this plan is very suitable where an increasing pressure is required.

[440]. Lever and toggle motion (see [Section 63]). Many variations are in use for stone breakers, &c. See [Section 13].

Knapping toggle motion. See [Nos. 269], [251].

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