Section 53.—MECHANICAL POWERS. APPLIANCES TO VARY POWER AND SPEED.
| [990].Lever of the 1st order | - | See Applications, [Section 48]. | |
| [991]. Lever of the 2nd order | |||
| [992]. Lever of the 3rd order | |||
[993]. Wheel and axle; power gained and speed reduced in proportion to the diameters of the two sheaves.
[994]. Return block; power multiplied 2 to 1.
[995]. Two double sheave blocks; power multiplied 4 to 1.
[996]. Four single blocks; power same as [No. 995].
[997]. Three return blocks; power multiplied 8 to 1.
See Applications, [Section 42].
The inclined plane is simply a modification of the force of gravity, which acts vertically.