Quotation from: General Science

Written by: Bertha M. Clark


If the force required by a machine is 150 pounds, while that
calculated as necessary is 100 pounds, the loss due to friction is 50
pounds, and the machine, instead of being thoroughly efficient, is
only two thirds efficient.


Machinists make every effort to eliminate from a machine the waste due
to friction, leveling and grinding to the most perfect smoothness and
adjustment every part of the machine. When the machine is in use,
friction may be further reduced by the use of lubricating oil.
Friction can never be totally eliminated, however, and machines of
even the finest construction lose by friction some of their
efficiency, while poorly constructed ones lose by friction as much as
one half of their efficiency.

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