The High-pressure Steam Engine Investigated: An Exposition of Its Comparative Merits, and an Essay Towards an Improved System of Construction, Adapted Especially to Secure Safety and Economy in Its Use, Partes1-2

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J. Weale, 1847
 

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Página iv - The High-Pressure Steam Engine. THE HIGH-PRESSURE STEAM ENGINE ; an Exposition of its Comparative Merits, and an Essay towards an Improved System of Construction, adapted especially to secure Safety and Economy. By Dr. ERNST ALBAN, Practical Machine Maker, Plau, Mecklenberg. Translated from the German, with Notes, by Dr. POLE, FRS, M.
Página 108 - ... preventing the explosion of vessels as those mentioned by Glauber. Speaking of the action of such safety-valves he observes, (page 7) " upon the top of a stopple [valve] there may be fastened some lead, that if the spirit be too strong, it will only heave up the stopple and let it fall down again." Papin's claim therefore is not to the valve itself, but to its improvement, or rather to the mode of applying it by means of a lever and moveable weight ; thereby not only preventing the valve from...
Página 75 - They must be placed in such a position, with regard to the furnace, that the flame may act upon them in the most favourable manner, and that the heat may be absorbed as completely as possible. — They must have such a proportion between their length and diameter, that neither the ebullition in them may become too violent, and the water be thereby ejected from them, nor that they become warped or made crooked by the heat. — They must properly convey away all the generated steam, and be regularly...
Página 124 - ... is the groove into which the turned end of the cylinder enters, and in which the lead ring is held ; gg is the ring riveted, by the rivets (d and h), upon the end of the cylinder. In order to give still greater security to the covers and to the cylinders themselves in the direction of their length, when of larger diameter, a strong bolt, with a head at one end and a screw and nut at the other, may be passed through both covers, running the whole length of the cylinder. This, however, interferes...
Página 75 - They must have such a proportion between their length and diameter, that neither the ebullition in them may become too violent, and the water be thereby ejected from them, nor that they become warped or made crooked by the heat. — They must properly convey away all the generated steam, and be regularly supplied with water. — They must be connected with the main part of the boiler in such a manner, that in case of a rupture of one of them, the whole content of water and steam cannot suddenly and...
Página vii - ... experience, of those who have done more ; and it is on this ground we invite attention to the following pages. " It must startle English Engineers not a little to be told that the high -pressure engine is both safer and more economical in its use than the low-pressure condensing one...
Página 37 - ... necessary in order to produce a sufficient draught in the chimney, but my experience has shown me that a much less temperature will answer the purpose; and if this assertion were true it would evidently get rid of the objection we are considering, since low-pressure engines must then be subject to a...
Página 108 - Papin's claim, therefore, is not to the valve itself, but to its improvements, or rather to the mode of applying it by means of a lever and moveable weight (proposed by him in 1681 for his digester); thereby not only preventing the valve from being blown entirely out of its place, but regulating the pressure at will, and rendering the device of universal application.
Página 7 - The English have, in a great measure, assisted in bringing this form of engine into discredit; — if not by open attacks, yet through the bad construction and arrangement of their engines: and it would have stood a chance of again passing into oblivion, had not the French, at a late date, bestirred themselves to prevent its downfall, by examining and making known its advantages, and by a series of gradual improvements in its construction. America and France remain тнв ONLY SDPFORTS of the SYSTEM,
Página 31 - ... and therefore a greater thickness of metal is necessary to produce an equal strength ; but since copper boilers never fly in pieces in case of explosion, it is not necessary to be too scrupulous in regard to this point. Even when the metal is thin, especially if the diameter is not great, the use of copper removes all danger of destructive explosion, since at most only a simple tearing asunder of the metal will ensue.

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