Chapter XLVI: Section 53: Mechanical Powers. Appliances to Vary Power and Speed

=990. Lever of the 1st order= }
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=991. Lever of the 2nd order= } See Applications, Section 48.
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=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.

=The wedge.= See Section 37.

=The screw= is simply a circular inclined plane. See Section 78.

See also Gearing, Sections 40 and 84.