. American engineer . Bolt Heating Furnace. laneous uses throughout the plant is a success as far as mereheating qualities and general convenience is concerned. It re-mains to consider it from an economical standpoint. ECONOMY OF GAS FURNACES. When the matter was under consideration before the shopswere built it was regarded mainly in the light of the heat unitsthat would be available and their cost. From analysis of the oilin use it was known that it had a calorific value of 133,000 34 AAtERICAN EX(;1XRI:R. L. 86, \o. Gas Furnaces foi the Forging Machines.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912