The steam engine : its origin and gradual improvement, from the time of Hero to the present day by Hodge P. R. (Paul Rapsey)

Author:Hodge, P. R. (Paul Rapsey)
Language: eng
Format: epub, pdf
Tags: Steam-engines
Publisher: New York, Appleton
Published: 1840-03-25T05:00:00+00:00

steam per stroke in the vacancies of the cylinder, making a total of about 140 cubic feet of steam per stroke ; which, multiplied by the number of strokes per hour (869 X 140), is equal to 121,640 cubic feet of steam, generated under a pressure of 35.2 inches of mercury, at a temperature of about 222° Fahrenheit.

" The " duty" performed was 34,467,052 Ibs. raised one foot high, with a bushel or 84 Ibs. of coals.

" The power of the engine during the time of trial was (28,577 Ibs. load X7.75 stroke X 14.48 strokes per minute -r 33,000) equal to 97.2 horses' power.

" The steam used was 1251 cubic feet per horse power, to produce which, at a temperature of 222° Fahrenheit, would require about 0.856 cubic feet of water; and to convert this quantity of water into steam at 222°, it required 4.82 Ibs. of coals."

96. Having thus seen the utility of this system, as practised in Cornwall, it will be desirable to exhibit its beneficial effects here also, as it is used in the steamboats on the North River. To enable the reader, therefore, to make comparisons himself, the following table has been carefully compiled ; giving, 1st, the requisite dimensions ; 2d, the cut-off; 3d, the pressure of the steam ; 4th, the quantity of fuel consumed; 5th, the amount of work done ; 6th, the time of doing the work of several of the most celebrated boats on the river. For particular descriptions of engines, with their working parts, the reader is referred to the tabular statement and explanation of the plates at the end of the volume.

97. Steamboats of the West. —Having thus considered the steam engine as used on the Eastern Rivers of the Union, we will proceed to notice the peculiar construction and principle of those used on the Western waters ; and for the purpose of better enabling the reader to understand the beauty of the arrangement of these machines, it will be well briefly to point out the difficulties to be overcome in the navigation of the mighty rivers of that vast country.

98. From the size and rapidity of these waters, the ordinary

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