. Electric railway journal . GASOLINE-PROPELLED INSPECTION CAR, DENVER, COL. culty. The car is equipped with an incandescent head-light, the current for which is supplied by storage bat-teries. When not working at night the batteries areeasily removed. The total weight of the car is 350 lb.,and the single cylinder two-cycle engine which drives itweighs 75 lb. This engine was designed and built in thecompanys shops and is shown in one of the pictures,which also illustrates the method of attaching the en-gine to the truck ENGINE OF INSPECTION CAR SHOWING METHOD OF MOUNTINGON FRAME OF TRU
. Electric railway journal . GASOLINE-PROPELLED INSPECTION CAR, DENVER, COL. culty. The car is equipped with an incandescent head-light, the current for which is supplied by storage bat-teries. When not working at night the batteries areeasily removed. The total weight of the car is 350 lb.,and the single cylinder two-cycle engine which drives itweighs 75 lb. This engine was designed and built in thecompanys shops and is shown in one of the pictures,which also illustrates the method of attaching the en-gine to the truck ENGINE OF INSPECTION CAR SHOWING METHOD OF MOUNTINGON FRAME OF TRUCK 1058 ELECTRIC RAILWAY JOURNAL [Vol. XLIX, No. 23 Heat Losses in Steam Plants* Boiler Economy Effected by Control of Excess Airand Combustible in Refuse BY H. F. LAWRENCE Test Engineer American Engineering Company, Philadelphia, Pa. In steam generating plant operation the heat lossesdue to excess air are the most important of any of theheat losses that can be controlled to any extent. Theupper set of curves in the accompanying illustrationshows the percentage of heat or percentage of coal whichis lost through the stack for different temperatures ofexcess gases and percentages of CO,. The straight lineslabeled Loss to stack at 450 deg., 500 deg. and 600 atmosphere due to theoretical air show the per-centage of coal required for heating the furnace gasesfrom atmospheric temperature up to the stack tempera-ture. With no excess air, and perfect combustion theselines represent the heat lost through the stack for
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