SOME THINGS TO KNOW
Q. What is fire?
A. Fire is the rapid combustion or consuming of organic
matter.
Q. What is water?
A. Water is a compound of oxygen and hydrogen. In weight
88 9-I0 parts oxygen to II I-I0 hydrogen. It has its maximum
density at 39 degrees Fahr., changes to steam at 2I2 degrees,
and to ice at 32 degrees.
Q. What is smoke?
A. It is unconsumed carbon finely divided escaping into
open air.
Q. Is excessive smoke a waste of fuel?
A. Yes.
Q. How will you prevent it
A. Keep a thin fire, and admit cold air sufficient to insure
perfect combustion.
Q. What is low water as applied to a boiler?
A. It is when the water is insufficient to cover all parts
exposed to the flames.
Q. What is the first thing to do on discovering that you have
low water?
A. Pull out the fire.
Q. Would it be safe to open the safety valve at such time?
A. No.
Q. Why not?
A. It would relieve the pressure on the water which being
allowed to flow over the excessive hot iron would flash into
steam, and might cause an explosion.
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