Catechism of the Locomotive |
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Common terms and phrases
admission admitted amount answer to Question attached axle BALDWIN LOCOMOTIVE bars bituminous coal boiler bolts burning called carbon carbonic dioxide cast iron centre line coal coal gas cock combustion compression connecting-rod crank crank-pin curve cylinder diagram diameter distance drawn Driving-axle driving-wheels eccentric eccentric-rod edge engine equal escape exhaust fastened fire fire-box flange foot foot-pounds force frame friction front end fuel gases grate hanger heating surface HINKLEY LOCOMOTIVE holes hydrogen increased indicated indicator diagram inside lap journal latter lever locomotive runner lower motion motion-curves move opening ordinary oxygen pipe piston piston-rod placed plates port position pounds proportion pump rails resistance rivets rocker-pin Scale screw seam shaft shown in fig side smoke-box space speed spring square inch steam pressure steam-chest steam-port strength stroke TANK LOCOMOTIVE temperature thick thread tion track train truck Truck-Wheels tube usually valve weight wheels
Popular passages
Page 27 - It overcomes the attractive forces that tend to hold the molecules of a substance together, and thus changes it from a solid to a liquid or from a liquid to a gas, according to the state it was in when the heat was applied.
Page 345 - 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 307 - THE BREADTH OF PLATE IN INCHES BY THE SQUARE OF THE THICKNESS IN SIXTEENTHS, AND BY THE NUMBER OF PLATES ; MULTIPLY, ALSO, THE STRENGTH IN TONS BY 11.3 : DIVIDE THE FORMER PRODUCT BY THE LATTER. THE RESULT IS THE WORKING SPAN IN INCHES.
Page 265 - Then throw the link down until the block comes opposite to the end of the eccentric-rod, and turn the wheels,* and at the same time, observe whether the travel of the valve is equal to the throw of the eccentric and also whether it travels equally on each side of the centre of the valve-face.
Page 390 - ... 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 388 - It is true of the coal as well as of the gases that the chemical action between it and the oxygen can only take place when the two are in intimate contact, and therefore the rapidity and completeness of combustion and intensity of heat will be increased by increasing the number of points of contact, or by reducing the size of the fuel. The coal should therefore be broken up, but not so small as to fall between the grate-bars or be carried out of the fire-box by the blast. QUESTION 394. What amount...
Page 117 - ... of accident to either the feed-pipe or pump, another valve, H^ fig. 66 ; called a check-valve, is placed between the feed-pipe and the boiler. The construction of this valve is similar to that of the pressure and suction valves. It is inclosed in a cast-iron or brass case, // All of these valves have cages in which they work and which also act as stops, which prevent them from rising from their seats further than a certain distance. This distance is called their lift, and the successful working...
Page 233 - ... that the momentum of the parts carries them further than the pressure of the steam alone would move them. The distance through which the pistons or instruments move, moreover, makes it impossible that the changes of pressure should be indicated simultaneously with the position of the piston ; the latter must travel while the action is taking place, and thus the diagram shows changes of pressure later or more gradually than they occur.* To overcome these and other difficulties, the piston-rod...
Page 207 - ... 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.
Page 307 - Multiply the strength in tons by span in inches, and divide by 11-3 ; multiply also the breadth of plate in inches by the square of the thickness in sixteenths ; divide the former product by the latter. Result, equal number of plates.