Don't depend on your glass gauge alone, for
several reasons. One is, if you depend on the glass entirely, the
try-cocks become limed up and are useless, solely because they are
not used.
Some time ago the writer was standing near a traction engine, when the
engineer, (I guess I must call him that) asked me to stay with the
engine a few minutes. I consented. After he had been gone a short time
I thought I would look after the water. It showed about two inches in
the glass, which was all right, but as I have advised you, I proposed to
know that it was there and thought I would prove it by trying the cocks.
But on attempting to try them I found them limed up solid. Had I been
hunting an engineer, that fellow would not have secured the job.
Suppose that before I had looked at the glass, it had bursted, which it
is liable to do any time. I would have shut the gauge cocks off as soon
as possible to stop the escaping steam and water. Then I would have
tried the cocks to find where the water was in the boiler. I would have
been in a bad boat, not knowing whether I had water or not.
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