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Title: |
1878 Article-A. Ransome & Co., Stationary Horizontal Steam Engine |
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Source: |
International Exhibition at Paris, 1878, pgs. 131-132 |
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Insert Date: |
1/29/2015 1:04:38 PM |
The engine illustrated in Fig. 178 is one of a new series, designed expressly for driving woodworking machinery, which possess several improvements that render them well suited for that purpose. The series embraces engines of all sizes, from 6 to 50 nominal horsepower; and every engine is guaranteed to indicate three and a half times its nominal power when marked with steam of 60 lbs. pressure, cutting off at half the stroke. The cylinders are all steam jacketed, and their outer shells are covered with felt, and lagged with strips of polished mahogany, thus preventing loss of heat by radiation. The steam ways are very short, and the openings from the cylinder to the exhaust are placed so low that any water which may condense in the cylinder when the engine has been standing at once drains from it. This obviates the necessity for priming cocks, and prevents accidents, which frequently occur with ordinary engines by starting them when there is water in the cylinder. These engines are all fitted with expansion slides, the stroke of which is directly controlled by an improved governor, in such a manner that the amount of steam admitted into the cylinder at each stroke is varied according to the work the engine is doing at the moment. This improvement effects a great economy of steam (and consequently of fuel), and secures perfect regularity of speed, no matter how much or how suddenly the amount of work which the engine is called upon to do may vary. Each engine is fitted with feed pump, and a fly-wheel of ample weight, turned on the face, to take a belt of sufficient width to transmit all the power which the engine is capable of giving out; but, if preferred, they can be fitted with toothed fly-wheels at a small increased cost. All the bearing surfaces are of great length, which enables them to run a long time without requiring repair; and although, from the special improvements introduced into these engines, they are of necessity more costly than those of the ordinary type, yet the saving which they effect in fuel will soon cover the difference in first cost. The boilers usually supplied with these engines are of the Galloway type, with one or two internal fines, according to size, and with a number of conical cross tubes for increasing the heating surface. They are all made with long fire grates for burning sawdust, chips, and other waste wood, instead of coal, and are fitted with complete sets of mountings of the best description Any of the above engines can be fitted with condensers at an extra cost of £2 to £3 per nominal horse-power. Improved feed water heaters are also charged extra.
Price.—Nominal horse-power 12, diameter of cylinder 10 in., length of stroke 20 in., revolutions per minute I 10, diameter of fly-wheel 6 ft., width of fly-wheel 9 in., £225. |
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1878 A. Ransome & Co., Stationary Horizontal Steam Engine
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