A. It protects the material from being burned or otherwise injured by the heat.
Q. Is there no radiation through these coverings?
A. Yes, but the loss is very slight, as the temperature of covering should never rise above what just seems warm to the hand.
Q. How should you feed water to a boiler?
A. Continuously during the whole time that steam is being used.
Q. Will a steam pump feed continuously?
A. Yes, by running the pump faster or slower according to the amount of water required.
Q. Why is a continuous feed preferable?
A. Because it maintains the water in the boiler at a uniform level and gives the most perfect action.
Q. Should precaution be taken in choice of water used in the boiler?