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Show 1 FSRST 21ID ; TO THE RILING HOUSE By Roger B. Whitman i SMALL COAL SIZES OECAUSE of the demand, stove " size coal sells at a higher price than nut coal and pea coal, which are smaller. There is, of course, a desire to use these smaller sizes because of economy. Under certain conditions this is quite possible, although al-though if the conditions are not met coal gas is produced. This may result re-sult in puffs and even small explosions explo-sions in the fire-box. or the passing of the coal gas through the house. With coal of stove size and larger, the spaces between the lumps permit per-mit the free passape of air, and coal gas is burned o f as fast as it is produced. The flickering blue flame above a bed of fresh coal is burning coal gas. A strong chimney draft may pull air through a bed of packed coal, but if there are thin places, air wiD rush through them with Ihe effect of a blacksmith's forge. This is a cause of clinkering. Forced draft is sometimes used through an electric elec-tric blower that forces air into the ash-pit With this there is also the possibility of clinkering. But there |