Definition of Horsipower
Horse" pow`er (?). 1. The power
which a horse exerts.
2. (Mach.) A unit of power, used in
stating the power required to drive machinery, and in estimating the
capabilities of animals or steam engines and other prime movers for
doing work. It is the power required for the performance of work at
the rate of 33,000 English units of work per minute; hence, it is the
power that must be exerted in lifting 33,000 pounds at the rate of
one foot per minute, or 550 pounds at the rate of one foot per
second, or 55 pounds at the rate of ten feet per second,
etc.
&fist; The power of a draught horse, of average strength, working
eight hours per day, is about four fifths of a standard horse
power.
Brake horse power, the net effective power
of a prime mover, as a steam engine, water wheel, etc., in horse
powers, as shown by a friction brake. See Friction brake,
under Friction. -- Indicated horse
power, the power exerted in the cylinder of an engine,
stated in horse powers, estimated from the diameter and speed of the
piston, and the mean effective pressure upon it as shown by an
indicator. See Indicator. -- Nominal horse
power (Steam Engine), a term still sometimes
used in England to express certain proportions of cylinder, but
having no value as a standard of measurement.
3. A machine worked by a horse, for driving
other machinery; a horse motor.
- Webster's Unabridged Dictionary (1913)
- A non-metric unit of power (symbol hp) with various definitions, the most common of which being approximately equal to 745.7 watts.
- A metric horsepower (symbol often PS from the German abbreviation), approximately equal to 735.5 watts.
- The Nuttall Encyclopedia
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