I have already advised you to carry a "high pressure;" by a high
pressure I mean any where from I00 to I25 lbs. I have done this
expecting you to use the steam expansively whenever possible, and the
expansive force of steam increases very rapidly after you have reached
70 lbs. Steam at 80 lbs. used expansively will do nine times the work
of steam at 25 lbs. Note the difference. Pressure 3 I-5 times greater.
Work performed, 9 times greater. I give you these facts trusting that
you will take advantage of them, and if your engine at I00 or I00 lbs.
will do your work cutting off at I/4, don't allow it to cut off at I/2.
If cutting off at I/2 will do the work, don't allow it to cut off at
3/4, and the result will be that you will do the work with the least
possible amount of fuel, and no one will have any reason to find fault
with you or your engine.
Now we have given you the three points which are absolutely necessary to
the successful handling of a traction engine, We went through it with
you when running as a stationary; then we gave you the pointers-to be
observed when running as a traction or road engine.
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