This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 edition. Excerpt: ...too, that the high-pressure steam is opposed only by the back pressure in the condenser, while the low-pressure steam during the return stroke is opposed by steam of the same pressure, the same steam in fact, acting, however, on a smaller area. In each case the atmospheric pressure on the trunk is in the same ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 edition. Excerpt: ...too, that the high-pressure steam is opposed only by the back pressure in the condenser, while the low-pressure steam during the return stroke is opposed by steam of the same pressure, the same steam in fact, acting, however, on a smaller area. In each case the atmospheric pressure on the trunk is in the same direction, assisting the high-pressure steam and opposing the low-pressure to an exactly equal extent. It follows therefore that the pressure during the return stroke must be more than that of the atmosphere, unless the latter is counterbalanced by a weight, or removed by the substitution of the condenser pressure. It is not easy to resort to this last expedient in the engines just described, except in a partial manner, by using the outer end of the trunk as the ram of the air-pump. It is, however, resorted to in some engines identical in principle with these, though differing a little in form, the arrangement being something of this kind;--a high and a low pressure cylinder are placed in one line, say, for instance, the high above the low, and the pistons secured to a single piston-rod. The ends of the two cylinders which are next each other, that is, the bottom of the high and the top of the low, are always in free communication with each other, and it is from this space that the atmospheric pressure is removed by connection with the condenser. Steam from the boiler is admitted above the small piston, and completes a stroke, as before, in the high cylinder. On exhausting it passes to the under side of the large piston, and produces the up-stroke by pressure on increased area. Here the high-pressure steam is opposed by the pressure in the condenser, and the low-pressure by steam of equal pressure, as in the case of the trunk compound...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.