American Engineer and Railroad Journal, Volume 80Simmons-Boardman Publishing Corporation, 1906 |
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Popular passages
Page 20 - ... position OE, when it closes and compression takes place until it again reaches OS for admission and One revolution is completed. By placing the Zeuner diagram upon this, draw HJ perpendicular to FG, and with the radius OH of the eccentric circle as a diameter, draw the admission valve circle OVHnO and the lap circle with the steam lap as a radius and find the intersection occurs at V, both with the circles and the previously laid down admission line OS and the cut-off point at the intersections...
Page 18 - ... cannot be changed except by changing the leverage relations of the combination lever. 3. A given lead determines the lap or a given lap determines the lead, and it must be divided for both ends as desired by lengthening or shortening the valve spindle. 4. Within certain limits, this adjustment may be made by shortening or lengthening the radius bar but it is desirable to keep the length of this bar equal to the radius of the link in order to meet the requirements of the first condition. 5. The...
Page 11 - Do not report cases where engines lose time and afterwards regain it without delay to connections or other traffic. 2. In cases where a passenger or scheduled freight train is delayed from other causes, and an engine (having a defect) makes up more time than it loses on its own account, should not be called an engine failure. 3. Do not report delays to passenger trains when they are less than five minutes late at terminals or junction points. 4. Do not report delays to scheduled freight trains when...
Page 52 - The throw as specified must be correctly obtained, and great care taken that the position shown in the design be adhered to. The crank representing the eccentric is permanently fixed to the pin, and the slightest variation will be detrimental. When the engine is assembled, the throw of the eccentric should be checked up by the specifications, and any error should be at once reported in order that the mistake may be rectified by either correcting the position of the eccentric, or by a change in the...
Page 18 - The lap and lead are determined by the proportion of the arms of the combination lever and the stroke of the piston. The amount is found by turning the engine from one dead center to the other center in any cut-off position. 1. The motion must be adjusted with the cranks on the dead centers by lengthening or shortening the eccentric rods until the link takes such a position as to impart no motion to the valve when the link block is moved from its extreme forward to its extreme backward position....
Page 85 - ... 10 per cent., while the best compound shows a saving over the poorest simple which is not far from 40 per cent. It should be remembered, however, that the conditions of the tests, which provide for the continuous operation of the locomotives at constant speed and load throughout the period covered by the observations, are all favorable to the compound.
Page 23 - The mode of procedure is now as follows : — The cutters are first placed upon the top of the furnace until they are warmed through, after which they are placed in the upper chamber (see Fig.
Page 84 - ... partially opened throttle show that when the degree of throttling is slight the effect is not appreciable. When the degree of throttling is more pronounced, the performance is less satisfactory than when carrying the same load with a full throttle and a shorter cut-off. THE LOCOMOTIVE AS A WHOLE 20.
Page 222 - Association with reference to single draft pipes states "that for the best results, the presence of a draft pipe requires a smaller stack than would be used without it but that no best combination of single draft pipe and stack could be found which gave a better draft than could be obtained by the use of a properly proportioned stack without the draft pipe. While the presence of a draft pipe will improve the draft when the stack is small it will not do so when the stack is sufficiently large to serve...
Page 19 - Zeuner, which coincide exactly as to the different valve movements, which may be found as follows : The distance AB represents the travel of the valve as well as the stroke of the engine, though in different scales, which makes no difference when the cut-off is always expressed in fractions or per cent of AB. The maximum cut-off is determined upon to be AR. Draw a perpendicular line RC from AB until it cuts the arc ACB. Next decide on a desired lead and, with that as a radius, draw an arc with A...