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. 1830 Excerpt: ...passes in its way to the cylinder; this arrangement has been very generally followed by manufacturers, but we do not perceive that any advantage can be gained by the practice; for it should be considered that the jacket presents a larger surface to the cooling influence of the atmosphere, than the cylinder itself, and, ...
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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. 1830 Excerpt: ...passes in its way to the cylinder; this arrangement has been very generally followed by manufacturers, but we do not perceive that any advantage can be gained by the practice; for it should be considered that the jacket presents a larger surface to the cooling influence of the atmosphere, than the cylinder itself, and, consequently, that it must condense the steam more rapidly. If the jacket be supplied by a separate steam pipe, still the loss from condensation in the jacket must fully compensate tor the greater pressure of the steam in the cylinder. The jacket also adds considerably to the weight of the engine. For these reasons, we think that the jacket might very well be dispensed with. Mr. Tredgold has, we find, anticipated us in recommending an airtight casing, which would lessen the condensation in the cylinder, make a saving in the expense of fuel, and keep the engine-house cooler. The following are the contrivances in general use for opening and closing the various steam passages; the first of these which we shall notice is the Throttle Valve, which is a thin disc placed on the steam pipe, between the boiler and the cylinder; it turns upon a spindle, which is regulated either by hand or by the governor, and may be set so as to intercept a greater or less portion of the steam in its passage, and regulate the supply according to the work. This valve is never wholly closed during the working of the engine. The above cut represents this valve, and requires no further explanation. Four-way Cock.--Of the various inventions of admitting the steam to pass to and from the cylinder, the fourway cock is one of the earliest and most simple. It was adopted by Leupold, who first purposed to use high-pressure steam under pistons; and Trevithick, who brought high-p...
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