soon have it up to I25, and should you want more steam at some other
time you will find yourself screwing it down again, and what was really
intended for a safety valve loses all its virtue as a safety, as far as
you and those around you are concerned. If you know you have a good
boiler you are safe in setting it at I25 pounds, provided you are
determined to not set it up to any higher pressure. But my advice to
you is that if your engine won't do the work required of it at 115
pounds, you had best do what you can with it until you can get a larger
one.

A safety valve is exactly what its name implies, and there should be a
heavy penalty for anyone taking that power away from it.

If you refuse to set your safety down at any time, it does not imply
that you are afraid of your boiler, but rather you understand your
business and realize your responsibility.

I stated before what you should do with the safety valve in starting a
new engine. You should also attend to this part of it every few days.
See that it does not become slow to work. You should note the pressure
every time it blows off; you know where it ought to blow off, so don't
allow it to stick or hold the steam beyond this pressure. If you are
careful about this, there is no danger about it sticking some time when
you don't happen to be watching the gauge. The steam gauge will tell
you when the pop ought to blow off, and you want to see that it does it.


PART FIVE _______

STEAM GAUGE