Modern Engineering Practice: A Reference Library..., Volume 8

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American School of Correspondence, 1906 - Engineering
 

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Page 355 - Flags of the proper color must be used by day and lamps of the proper color by night or whenever from fog or other cause, the day signals cannot be clearly seen.
Page 202 - ... place and may result in a permanent distortion of the divided arc, thus destroying the accuracy of the sextant. The horizon glass should be perpendicular to the plane of the sextant, as should the index glass, also. The line of sight of the telescope should be parallel to the plane of the instrument. If there were no index error, the zero or first graduation on the scale should coincide with the first mark on the vernier. Index error is common, and can...
Page 323 - Fig. 3 shows the arrangement of the cylinders in relation to the valve. The valve employed to distribute the steam to the cylinders is of the piston type, working in a cylindrical steam-chest located in the saddle of the cylinder casting between the cylinders and the smoke-box, and as close to the cylinders as convenience wiil permit.
Page 209 - ... mean sun" which moves in a uniform rate along the equator. This is called mean solar time. The difference between mean and apparent time is called the equation of time. To convert apparent time into mean time, take from the Nautical Almanac the equation of time and add it or subtract it according to the direction given at the column. The equation of time is sometimes defined as a quantity to be added algebraically to apparent time to get mean time.
Page 371 - ... from the rear of his train, and he must remain there until recalled by the whistle of his engine ; but if a passenger train is due within ten minutes, he must remain until it arrives. When he comes in, he will remove the torpedo nearest to the train, but the two torpedoes must be left on the rail as a caution signal to any following train.
Page 375 - Conductors and enginemen will be held equally responsible for the violation of any of the rules governing the safety of their trains and they must take every precaution for the protection of their trains, even if not provided for by the rules. 121. In all cases of doubt or uncertainty take the safe course and run no risks.
Page 330 - ... the wheels have broad grooved tires a foot or so in width that are adapted to running upon a track formed of logs placed end to end. The other is known as the Shay locomotive and is fitted to run on ordinary rails. Such an engine is shown in Fig.
Page 146 - However the water is a yielding medium and for this reason the pressure of the blades causes the water acted on to be driven back instead of remaining firm. Then the actual speed of the ship (when referred to the undisturbed water at a slight distance from the ship) is less than the speed of the screw. This difference is called slip. Slip is the difference between the speed of the screw and the speed of the ship, relative to still water. It is expressed in feet per minute and as a per cent, of the...
Page 323 - ... smoke-box, and as close to the cylinders as convenience will permit. As the steam-chest must have the necessary steam passages cast in it and dressed accurately to the required sizes, the main passages in the cylinder casting leading thereto are cast wider than the finished ports. The steam-chest is bored out enough larger than the diameter of the valve to permit the use of a hard cast iron bushing (Fig.
Page 335 - Suppose, for example, that 5,000 feet of 1 per cent, grade were so situated that trains could approach it at speed. The total rise of the grade would be 50 feet, but of that 15 feet could be overcome by the energy of the train, leaving 35 feet that the train must be raised by the engine. A grade in which the rise is 35 feet in 5,000 would be a 0.7 per cent, grade, so that if the engine could exert sufficient force to overcome the train resistance and that due to a 0.7 per cent, grade, the train could...

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