Catechism of the Locomotive

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Railroad Gazette, 1881 - Locomotives - 609 pages
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Page 26 - Yes ; it has been found, from the most carefully-made experiments that the amount of heat which is required to raise the temperature of one pound of liquid water by one degree of Fahrenheit* is equivalent to 772 foot-pounds of work.
Page 341 - Divide the pitch, or, which is the same thing, the side of the thread into eight equal parts, take off one part from the top and fill in one part in the bottom of the thread, then the flat top and bottom will equal one-eighth of the pitch; the wearing surface will be three-quarters of the pitch, and the diameter of screw at bottom ot the thread will be expressed by the formula: 1,299 Diameter, Number of threads per inch The tables on the preceding pages are reprinted from Mr. Sellers' essay; they...
Page 180 - Since the valve must move a distance equal to the outside lap before admission can take place, it is evident that the eccentric can no longer be at right angles to the crank at the beginning of the stroke, but must be ahead of the right-angle point by an amount equal to AOC.
Page vi - Frisi. 2s. 6d. 125. COMBUSTION OF COAL, AND THE PREVENTION OF SMOKE, by C. Wye Williams, MICE 3s.
Page 177 - What is meant by the valve-gear of a locomotive ? Answer. By the valve-gear is meant the arrangement of eccentrics, rods, links, rockers, etc., by which the valves are moved and their motion regulated. QUESTION 183. What is required of the valve-gear in working a locomotive? Answer. It must be so arranged that the locomotive can be run either backward or forward, and so that the motion of the wheels can be reversed quickly and with certainty. It should enable the runner to employ the greatest power...
Page 367 - This dust is at once intensely heated, and each glowing particle becomes a centre of radiation, throwing out its luminous pulsations in every direction. The sparks last, however, but an instant, for the next moment the charcoal is itself consumed by the fierce oxygen, now aroused to full activity, and only a transparent gas rises from the flame. But the same process continues ; other particles succeed, which become ignited in their turn, and hence, although the sparks are evanescent, the light is...
Page 386 - ... 33* of the gaseous products of combustion, which would otherwise prevent the free access of air to the fuel. The more minute the division and the greater the velocity with which the air rushes among the fuel, the smaller is the additional quantity of air required for dilution. In locomotive boilers, although this quantity has not been exactly ascertained, there is reason to believe that it may on an average be estimated at about one-half of the air required for combustion.* We would therefore...
Page 203 - ... stroke, and will indicate all the defects resulting from bad proportions or construction, lost motion in the parts, or other causes of error or irregularity. In using this instrument, however, it is impracticable to attach a board to the inside of the cross-head, and it must therefore be fastened to the outside. The horizontal arm E should be made of thin steel, so as to form a spring.
Page 203 - T\ of an inch in diameter. This hole has a screw thread cut in it. into which an ordinary hard drawing-pencil is screwed. The spring is so arranged that the pencil will not be in contact with the board, unless it be pressed against it. The locomotive is then placed on a smooth piece of track with steam on and run very slowly, so that a person walking alongside can press the pencil against the surface of the board, which should be covered with drawing-paper. By watching the cross-head when it reaches...
Page 42 - Fig. 51 also rotates with the shaft. An eccentric is a crank of special form which imparts reciprocating motion to the valve through the eccentric rod and valve stem. The eccentricity of the eccentric is the distance between the center of the eccentric and the center of the shaft. The travel of the valve is equal to the throw of the eccentric, or twice the eccentricity. Changing the eccentricity changes the travel of the valve.

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