Then shut the drain cock and open both gauge
cocks and you will see the water seek its level, and you can rest
assured that it is reliable. This little operation I want you to
perform every day you run an engine. It will prevent you from thinking
you have water. I don't want you to think so. I intend that you shall
know it. You remember we said, if you know you have water, you are
safe, and every one around you will be safe.
Now here is something I want you to remember. Never be guilty of going
to your engine in the morning and building a fire simply because you see
water in the glass. We could give you the names of a score of men who
have ruined their engines by doing this very thing. You, as a matter of
course, want to know why this can do any harm. It could not, if the
water in the boiler was as high as it shows in the glass, but it is not
always there, and that is what causes the trouble. Well, if it showed
in the glass, why was it not there? You probably have lived long enough
in the world to know that there are a great many boys in it, and it
seems to be second nature with them to turn everything on an engine that
is possible to turn.
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