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.
Pages:
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135