STEAM PRESSURE AND HORSE POWER.
A correspondent of the English Mechanic writes:— "ln your issue of May 15 you say : 'When you find that the water is below the bottom gage tap, and the stream is rising rapidly, you should haul the fire at once.' If you are gaining stream, and then start and haul the fire! you will gain from 10 to 15 lbs more, as I have experienced in locomotives. I would recommend this : Pill the furnace with coal so as to choke the fire, keeping the engine and pumps on until you get water in gage gluss or steam gets low, then haul the fire if required. How would that do ? A. In this case it mi»ht not be advisable to start the feed ; and if you could stop forming st am more quickly by throwing coal on the fire than by hauling it, you would find the quickest way to be the best way. We believe that, m^ general, hauling the fire will be most efficient. 2. We have a direct acting locomotive engine with cylinders ]2 inches in diameter by 24 inches stroke. Steam pressure is loOiha, and driving wheels 5 feet, four wheels coupled. She weighs, when coaled and ready for running, about 47 tons. What is her horse power V The Editor of the Mechanic replies :— ( ' We could not answer this question without having some idea of the mean pressure in her cylinders."
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Bibliographic details
Otago Witness, Issue 1243, 25 September 1875, Page 3
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240STEAM PRESSURE AND HORSE POWER. Otago Witness, Issue 1243, 25 September 1875, Page 3
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