That there is a gain in a high pressure, can be shown very easily:
For instance, 100 pounds of coal will raise a certain amount of water
from 60 degrees, to 5 pounds steam pressure, and 102.9 pounds would
raise the same water to 80 pounds, and 104.4 would raise it to 160
pounds, and this 160 pounds would produce a large increase of power over
the 80 pounds at a very slight increase of fuel. The compound engine
will furnish the same number of horse power, with less fuel than the
simple engine, but only when they are run at the full load all the time.
If, however, the load fluctuates and should the load be light for any
considerable part of the day, they will waste the fuel instead of saving
it over the simple engine.
No engine can be subjected to more variation of loads than the traction
engine, and as the above are facts the reader can draw his own
conclusions.
FRICTION CLUTCH
The friction clutch is now used almost exclusively for engaging the
engine with the propelling gearing of the traction drivers, and it will
most likely give you more trouble than any one thing on your engine,
from the fact that to be satisfactory they require a nicety of
adjustment, that is very difficult to attain, a half turn of the
expansion bolt one way or the other may make your clutch work very
nicely, or very unsatisfactory, and you can only learn this by carefully
adjusting of friction shoes, until you learn just how much clearance
they will stand when lever is out, in order to hold sufficient when
lever is thrown in.
Pages:
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132