h 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
furnishing. To get the best results a belt wants to sag slightly as it
hugs the pulley closer, and will last much longer.

SOMETHING ABOUT SIGHT-FEED LUBRICATORS

All such lubricators feed oil through the drop-nipple by hydrostatic
pressure; that is, the water of condensation in the condenser and its
pipe being elevated above the oil magazine forces the oil out of the
latter by just so much pressure as the column of water is higher than
the exit or outlet of oil-nipple. The higher the column of water the
more positive will the oil feeds. As soon as the oil drop leaves the
nipple it ceases to be actuated by the hydrostatic pressure, and rises
through the water in the sight-glass merely by the difference of its
specific gravity, as compared with water and then passes off through the
ducts provided to the parts to be lubricated.

For stationary engines the double connection is preferable, and should
always be connected to the live steam pipe above the throttle. The
discharge arm should always be long enough (4 to 6 inches) to insure the
oil magazine and condenser from getting too hot, otherwise it will not
condense fast enough to give continuous feed of oil. For traction or
road engines the single connection is used. These can be connected to
live steam pipe or directly to steam chest.

In a general way it may be stated that certain precaution must be taken
to insure the satisfactory operation of all sight-feed l