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.