HOW MUCH is A HORSE POWER
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Mssrs. EDIToRs Perhaps your correspondent G, in the
Inegencer of this morning, may be aided in his specua-


tons upon the meaning Of the term horsepower" by read
ing the following note.


When Boulon and Watt about introduce the roa-
tive steam-engnes and to employ them in milwor they
felt the necessity of adopting mode of describing the
which would be easily understood by the persons who
likely them, and the power of mill horse was
considered suitable unit of comparison.


They assumed that horse going at the of q miles
hour, could raise weight of so lbs by rope passing
puly this would give lbs raised foot
high per hour $4,000 lbs per minute and this
ponds very well with the results Of experience for horse
working eight hours per day if the weight be increased he
would not be able to work many hours per day, and
perSa


The horsepower" is conventional some writers
at 20 900 lbs, whilst others adopt 25 000 80 000
and high A, 600. Now in the application Of the
the power of steam-engnes the expression So lO0
200 horse power commonly used that is to say the
CINE of the power specified when working under the pres
of steam for which it designed by the maker But it
obvious that the power of the engine varies with the pres
exerted upon the piston In condensing engines the
pressure each square inch may vary from 10 to 80 lbs
while in the non-condensng, pressure engine,
called the pressure upon the piston may vary from 60 to l20
lbs, and must perceive tiat the term is
eract, but convenient. S.


WAsHINGTos, SEPTEMBER Is, 1s47