# Cyclopedia of Locomotive Engineering, with Examination Questions and Answers: A Practical Manual on the Construction, Care and Management of Modern Locomotives, Including Boiler Construction, Valves and Valve Gears, Indicators, Locomotive Equipments, Including Headlights and Mechanical Stokers. Special Chapters on the Air Brake (Google eBook)

F.J. Drake & Company, pub. for Sears, Roebuck & Company, 1919 - Locomotives - 814 pages

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Page 29 - ... melting ice, or from a liquid to a gaseous state, as with water evaporated into steam. But the heat so disappearing has not been lost, on the contrary it has, while becoming latent, been doing an immense amount of work, as can easily be ascertained by means of a few simple figures. It has been seen that a heat unit is the quantity of heat required to raise one pound of water one degree in temperature...
Page 217 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Page 223 - Eccentric throw is the distance from the center of the eccentric to the center of the shaft. This definition also applies to the term "radius of eccentricity." Eccentric position. The location of the highest point of the eccentric relative to the center of the crank pin, measured or expressed in degrees. Angular advance.
Page 270 - It is obvious that in starting these locomotives with full trains from a state of rest, it is necessary to admit steam to the low-pressure ^cylinder as well as to the high-pressure cylinder, which is accomplished by the use of a starting valve (Fig.
Page 75 - To find the area of a circular SEGMENT by the TABLE. Divide the height of the segment by the diameter of the circle ; look for the quotient in the column of heights in the table ; take out the corresponding number in the column of areas ; and multiply it by the square of the diameter. It is to be observed, that the figures in each of the columns in the table are decimals. If accuracy is required, and the quotient...
Page 285 - Therefore, the heating surfaces and grate area are practically the same in both types, and the evaporative efficiency of both locomotives is determined by the action of the exhaust, which must be of sufficient intensity in both cases to generate the amount of steam necessary for utilizing, to the best advantage, the weight on the driving-wheels. This is...
Page 217 - The action of the piston as it nears the end of the stroke, in reducing the volume and raising the pressure of the steam retained in the cylinder ahead of the piston by the closing of the exhaust valve. Boyle's or Mariotte' s law of expanding gases. "The pressure of a gas at a constant temperature varies inversely as the space it occupies.
Page 397 - Repairing. — This valve having flat seats on the same plane is very easily made tight if it leaks by following these directions, viz. : With an ordinary lathe slightly turn off the two concentric seats of the valve and valve shell or base respectively, being careful that this is done in the same plane and perpendicular to the axis of the valve. The valve will then fit tightly on the valve shell. If no lathe is at hand then grind the valve proper on a perfectly flat surface of iron or steel, until...
Page 284 - By the consumption of a smaller quantity of steam in the cylinders than is necessary for a single-expansion locomotive doing the same work. 2. The amount of water evaporated in doing the same work being less in the compound, a slower rate of combustion combined with a mild exhaust produces a higher efficiency from the coal burned. In a stationary engine, which does not produce its own steam supply, it is of course proper to measure its efficiency solely by its economical consumption of steam. In...
Page 703 - Charging and Release Position. The purpose of this position is to provide a large and direct passage from the main reservoir to the brake pipe, to permit a rapid flow of air into the latter to...