A. 150 cubic feet of air for every pound of coal.
Q. How many pounds of air are required to burn one pound of carbon?
A. Twelve.
Q. How many pounds of air are required to burn one pound of hydrogen?
A. Thirty-six.
Q. Is hydrogen hotter than carbon?
A. Yes, four and one-half times hotter.
Q. What part of the coal gives out the most heat?
A. The hydrogen does part for part, but as there is so much more of carbon than hydrogen in the coal we get the greatest amount of heat from carbon.
Q. In how many different ways is heat transmitted?