buyer. But the good engineer knows better than to treat his engine that
way.

Never attempt to pull your loads over a steep hill without being certain
that your clutch is in good shape, and if you have any doubts about it
put in the tight gear pin. Most all engines have both the friction and
the tight gear pin. The pin is much the safer in a hilly country, and
if you have learned the secret of the throttle you can handle just as
big load with the pin as with the clutch, and will never tear your
gearing off or lose the stud bolts in boiler.

The following may assist you in determining or arriving at some idea of
the amount of power you are supplying with your engine:

For instance, a I inch belt of the standard grade with the proper
tention, neither too tight or too loose, running at a. maximum spead of
800 ft. a minute will transmit one horse power, running 1600 ft. 2 horse
power and 2400 ft. 3 horse power. A 2 inch belt, at the same speed,
twice the power.

Now if you know the circumference of your fly wheel, the number of
revolutions your engine is making and the width of belt, you can figure
very nearly the amount of power you can supply without slipping your
belt. For instance, we will say your fly wheel is 40 inches in diameter
or 10.5 feet nearly in circumference and your engine was running 225
revolutions a minute, your belt would be traveling 225 x 10.5 feet =
2362.5 feet or very nearly 2400 ft. and if I inch of belt would transmit
3 H. P. running this speed, a 6 inch belt would transmit 18 H.P., a 7
inch belt, 21 H.P., an 8 inch belt 24 H.P., and so on. With the above
as a basis for figuring you can satisfy yourself as to the power you are