A Practical View of the Steam Engine: Illustrated by Engravings of the Largest Machine in Scotland ...A. Balfour and Company, 1830 - 175 Seiten |
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A Practical View of the Steam Engine: Illustrated by Engravings of the ... John Milne Keine Leseprobe verfügbar - 2016 |
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Häufige Begriffe und Wortgruppen
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Beliebte Passagen
Seite 96 - ... malting, which are separated before the malt is sent to market. About a bushel of these is thrown into the boiler, and when the steam is again raised, an immediate effect is visible; for there is not only a plentiful supply of steam to produce the full working speed of the engine, but an excess of it going waste at the safety valve: this singular effect will continue for several days.
Seite 96 - I do not, however, see any analogy between this process, and the effect produced in the engine boiler before mentioned. . :; The sediment, in boilers, produced after wet weather, is chiefly composed of clay, and does comparatively little injury to the boiler ; but, in general the common mine water which percolates very slowly through the strata, produces a sediment of sulphate of lime, which adheres so closely to the bottom of the boiler, that it cannot be removed but by punching it off with a sharp...
Seite 2 - Majesty to inquire into the subject of weights and measures, that a cubic inch of distilled water weighed in air by brass weights at the temperature of 62 degrees of Fahrenheit's thermometer, the barometer being at 30 inches, is equal to 252 grains, and 456 thousandth parts of a grain...
Seite 12 - VI. The density of steam is nearly if not accurately proportional to its elasticity ; at least this may be affirmed of it within the limits of Mr. Southern's experiments, which extended to steam formed under a pressure of 120 inches of mercury, or of four atmospheres. Thus steam of elasticity = 40 inches of mercury required...
Seite 96 - ... scale of the iron plate of the boiler adhering to it. In this way the boiler is not only injured, but if the sediment accumulates at any part of the bottom, the plates are liable to become red hot at the place which greatly injures them. To lessen these injurious effects, it is the practice to throw into the boiler a quantity of peat earth in its natural plastic state, which is found to have a considerable effect in preventing the sediment from adhering so closely to the boiler plates. I remain,...
Seite 150 - Hence the total pressure upon the side of a vessel containing water will be equal to the weight of a column of water whose base is equal to the area of...
Seite 80 - As 7 is to 22, so is the diameter to the circumference; or, as 22 is to 7, so is the circumference to the diameter.
Seite 90 - ... or other means of admitting steam from the boiler into the cylinder or cylinders, in such a manner as that the steam may be admitted very gradually by a progressive enlargement of the aperture, so as at first to wiredraw, and afterwards admit more freely the same. The reason for this precaution is this : steam of such great elastic force as I employ, if admitted suddenly into the cylinder or cylinders, when more than one working cylinder is employed, would strike with a force that would endanger...
Seite 150 - ... mixed with whitening or with lamp-black. These things being attended to, and a portion of mercury placed within the cylinder, by pushing down the piston the fluid will ascend in a thin film between it and the cylinder, till the statical weight of the mercury, acting on the base of the floating piston, balances the force exerted in pushing it down. Hence, since the statical weight of the fluid increases reciprocally as the height to which it is caused to ascend by its displacing force, so must...
Seite 90 - ... of my aforesaid discovery, by making the boiler, and the steam case or cases in which the working cylinder or cylinders is or are inclosed, much stronger than usual ; and by altering the structure and dimensions of the cocks, valves, slides, or other means of admitting steam from the boiler into the cylinder or cylinders, in such a manner as that the steam may be admitted very gradually by a progressive enlargement of the aperture, so as at first to wiredraw, and afterwards admit more freely...