MEXICO CITY ELECTRIC PLANT STEAM ENGINE
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Compound Semi Portable engine with Twin Boilers
Constructed by Messrs. John Fowlers and Co., Limited, Engineers, Leeds.
A 100 horse power compound semi portable under type engine, with a high pressure cylinder 17 in. in diameter, and a low pressure 27 in. in diameter, by 30 in. stroke. Both cylinders are fitted with Hartnell’s patent automatic expansion gear controlled by one governor. The low pressure expansion valve is also fitted with the means of varying the proportion of cut-off without altering the high pressure cut-off. The frames are made of steel plates; the crankshaft is of steel, with the webs balanced, and is 10 in. diameter. The twin boilers are of the ordinary locomotive type, and each of them has 20 square feet of grate surface. The speed of the engine is 80 revolutions per minute, and at this speed with a boiler pressure of 125 lb. during a trial in the maker’s works, the engine indicated 286.3 horse power, of which 144.8 was given off from the high-pressure cylinder, and 141.5 from the low pressure cylinder. The exhaust from the high pressure cylinder to the low pressure steam chest passes through a copper pipe in the smokebox, which is common to both boilers. Each boiler is fitted with a Worthington pump of sufficient size to feed both boilers, and the feed pipes are so arranged that either pump can supply either or both boilers. When working at full power with steam cut off at seven-eights of the stroke in the high pressure cylinder, the engine gave off 452 horse-power. The makers, Messrs. Fowler and Co., of Leeds, have a similar engine in hand for the same users, who are engaged in the electric lighting of the City of Mexico.
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