A Catechism of the Steam Engine: Illustrative of the Scientific Principles Upon which Its Operation Depends, and the Practical Details of Its Structure, in Its Application to Mines, Mills, Steam Navigation and Railways ...D. Appleton, 1854 - 288 páginas |
Outras edições - Ver tudo
A Catechism of the Steam Engine: Illustrative of the Scientific Principles ... John Bourne (C. E.) Visualização integral - 1859 |
A Catechism of the Steam Engine: Illustrative of the Scientific Principles ... John Bourne (C.E.) Visualização integral - 1850 |
Palavras e frases frequentes
actual horse power air pump amount attached axle bars bearing blast pipe bolts bottom Boulton and Watt brass cast-iron centre centrifugal force chimney coal condensing engines connecting rod copper crank pin cross head cube root cubic feet cubic foot cylinder in inches diameter distance divide double acting eccentric rod edge evaporated expansion expedient fire box flange float flue foot frame friction furnace heating surface high pressure engines holes inch of section increased keelson length lever malleable iron marine boilers means metal motion multiplied nominal horse power nominal power oscillating engines packing paddle shaft passing pendulum piece piston in lbs piston rod pound prevent proportion Q.-What Q.-Will quantity quotient resistance ring rivets rolling circle screw sectional area side side rod speed square feet square inch square root steam pipe steam vessels straight edge strain stroke stuffing box temperature thickness trunnion tubes vacuum velocity vertical weight wheel whereby
Passagens conhecidas
Página 79 - Constant of an engine is found by multiplying the area of the piston in square inches by the speed of the piston in feet per minute and dividing the product by 33,000.
Página 56 - Let 17 times the length of the grate in inches be divided by the square root of the height of the chimney in feet, and the quotient is the area for the aperture at the top of the chimney in inches.
Página 118 - Strips of iron cut in the direction of the fibre were found to be about 6 per cent, stronger than when cut across the grain. Repeated piling and welding was found to increase the tenacity of the iron, but the result of welding together different kinds of iron was not found to be favourable.
Página 38 - ... that the gain in the vacuum does not equal the loss of power occasioned by the additional load upon the pump, and there is, therefore, a clear loss by the reduction of the temperature below 100°, if such reduction be caused by the admission of an additional quantity of water. If the reduction of temperature, however, be caused by the use of colder water, there is a gain produced by it, though the gain will within certain limits be greater, if advantage be taken of the lowness of the temperature...
Página 50 - Rule : Multiply the square of the diameter of the cylinder in inches by the cube root of the stroke in feet, and divide the product by 47. The quotient is the nominal horse-power of the engine.
Página 249 - ... keys from working out. The brass is tightened by a gib and cutter, which is kept from working loose by three pinching screws and a cross pin or cutter through the point. The effect of this arrangement "is to lengthen the rod, but at the cross-head end of the rod the elongation is neutralized by making the strap loose, so that, in tightening the brass, the rod is shortened by an amount equal to its elongation at the crank-pin end. The tightening here is also effected by a gib and cutter, which...
Página 121 - Nevertheless, marine boilers seldom last more than for 5 or 6 years, whereas land boilers made of the same quality of iron often last 18 or 20 years, and it does not appear probable that land boilers would last a very much shorter time if salt water were used in them. The thin film of scale spread over the parts of a marine boiler situated beneath the water, effectually protect them from corrosion : and when the other parts are completely worn out the flues generally remain so perfect, that the hammer...
Página 75 - ... by the speed of the piston in feet per minute, and divide the product by 120,000 ; the quotient is the power of the engine in nominal horses power.
Página 74 - If a further amount of expansion than this is wanted, it may be accomplished by wiredrawing the steam, or by so contracting the steam passage, that the pressure within the cylinder must decline when the speed of the piston is accelerated, as it is about the middle of the stroke. Thus, for example, if the valve be so made as to shut off the steam by the time two-thirds of the stroke have been performed, and the steam be at the same time throttled in the steam pipe, the full pressure of the steam within...
Página 239 - In some of Stephenson's engines with variable expansion gear, the regulator consists of a slide valve covering a port on the top of the valve chests. A rod passes from this valve through the smoke-box below the boiler, and by means of a lever parallel to the starting lever, is brought up to the engineer's reach. Cocks were at first used as regulators, but were given up, as they were found liable to stick fast. A gridiron slide valve has been used by Stephenson, which consists of a perforated square...