. Electric railway journal . Self-Contained Unit—General View Showing AuxiliaryEquipment ment except the generator, for the ordinary sizes andranges below $50 for the larger machines. The new unit consists of a compound engine mountedon an internally fired boiler, the engine cylinders beinginclosed in the smoke box, which also contains a super-heater, a reheater and all high-pressure piping and valves aswell as the intermediate piping. A special casing compels the hot gases as they leave the boiler tubes to traverse thesuperheater and reheater before emerging into the smokebox proper on their
. Electric railway journal . Self-Contained Unit—General View Showing AuxiliaryEquipment ment except the generator, for the ordinary sizes andranges below $50 for the larger machines. The new unit consists of a compound engine mountedon an internally fired boiler, the engine cylinders beinginclosed in the smoke box, which also contains a super-heater, a reheater and all high-pressure piping and valves aswell as the intermediate piping. A special casing compels the hot gases as they leave the boiler tubes to traverse thesuperheater and reheater before emerging into the smokebox proper on their way to the stack. The engine drives a feed pump which supplies the boilerthrough a tubular heater in the exhaust line. The en-gine exhausts into a suitable condenser equipped with anair pump also directly driven from the main engine, al-. Self-Contained Unit—Longitudinal Section Showing Ar-rangement of Machinery though when a supply of water for condensing purposesis not available the unit is operated non-condensing. The boiler is of the internal corrugated furnace fire-tube type. The furnace tubes and tube sheets constitutethe entire active heating surface; therefore deteriorationand need of repairs are confined to these parts which areattached to the boiler shell by studs and nuts, so that theyare readily removable for inspection and cleaning. Sedi-ment collects in the bottom of the boiler (the coolest part)and can be readily blown off. A steam pressure of 225lb. per square inch is carried. The initial superheater consists of a single coil of seam-less steel tubing. The steam passes through it in a di-rection counter to that of the hot gases, and the flexibilityof the coil prevents any expansion strains in the high-pressure valves or fittings. The steam on its way fromthe high-pressure cylinder to the low-pressure
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