Ray Cummings,
The Big Idea — VII. Jimmy Plays Trumps
(1920)
“ In modern furnaces, for the fusion of glass or other operations where great heat is necessary, the process of combustion of the fuel is carried on, not in one operation, as it is in the simple furnaces with which every one is familiar, but in two distinct, separate, progressive stages. The first stage takes place in a subsidiary furnace known as a “gas producer.” Here part of the heat which the fuel is capable of generating is utilized for the production of a combustible gas. In other words the fuel is changed into gaseous form, but only partly burned. ”
