The engineer's common-place book of practical reference - Tapa blanda

Sinopsis

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. 1848 Excerpt: ...intermixture of the steam with that of cold water in a vessel conveniently communicating with the eduction valve from the cylinder, the vessel being so sufficiently formed as to defy any admission of atmospheric air, otherwise than what may be carried in by the steam and by the water, through which condensation of the steam is to be accomplished. Water is found invariably to contain atmospheric air, and not unfrequently carbonic acid and other gases, which are not destroyed, but merely separated by the caloric or heat necessary to the formation of steam, and with it are carried into the cylinder; hence the propriety of the Air pump, by which to remove the heated vapours that would thus accumulate in the cylinder to impede the piston's motion, and also to remove the water from the condenser, after its having performed the duty of destroying by absorption the calorific properties of the steam. The capacity of the condenser ought to be as large as circumstances will conveniently admit, and certainly not less than one-eighth the capacity of the cylinder; and it ought to be particularly observed in those of marine engines, that where the bottom of condenser and bottom of cylinder are nearly on the same line, care be taken in making the passage between the valves and condenser sufficiently large to contain the condensing water for one stroke of the piston, besides leaving ample communication, otherwise the connexion between the cylinder and air pump will be cut off by water of nearly 100 of heat, on account of the cylinder being twice filled with steam for each effective stroke of the air pump. To produce the greatest amount of effect in an engine, the condensed water ought not to exceed in temperature 100 Faht., and to obtain which requires about 30 cubic inches...

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