Railways and Locomotives: Lectures Delivered at the School of Military Engineering at Chatham in 1877Longmans, Green and Company, 1882 - 427 páginas |
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Términos y frases comunes
amount apparatus applied arrangement axle axle-box ballast block system bogie boiler bolts break break of gauge break-block buffers carriage centre chairs considerable construction coupling crank crank pin cross sleepers curves cylinder diagram fig diameter driving wheels eccentric electric signals electric telegraph embankments engine engine-driver feet fire-box flanges frame friction gauge gradient inches incline indicator diagram interlocking iron lecture length load locking bar locomotive longitudinal main line mean effective pressure means miles mode motion moved needle ordinary pair of wheels pass passenger piston placed plates point lever point rail position pressure ring road rolling stock ruling gradient screw screw-jacks shaft shown in fig side signal box signal levers signalling stations signalman slide valve speed springs steam stroke surface temporary lines timber tion tire tons traction traffic train trucks tunnel tyre underframe vehicles vertical viaduct waggon weight wheel base width
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Página 283 - Maxwell diagram, the force vector sequence for the external forces is read from A to B, B to C, C to D, and so on...
Página 283 - train staff' system no engine-driver may start from any station forming the terminus of a district without having actually in his possession the staff belonging to that district, and as the staff cannot be in two places at once, it is impossible that a collision can take place between two engines. Supposing that a train is travelling from A to D, the driver of the train will receive the proper staff at A, give' it up to the station-master at B, receive another staff at B, give that up at c, receive...
Página 142 - If a man were to go blindfold into a signal-box with an interlocking apparatus, he might, so far as accordance between points and signals is concerned, be allowed with safety to pull over any lever at random. He might doubtless delay the traffic, because he might not know which signal to lower for a particular train, but he could not lower such a signal, or produce such a combination of position of points and signals, as would, if the signals were obeyed, produce a collision.
Página 57 - It appears to be frequently forgotten that although lofty embankments and deep cuttings, bridges, viaducts, and tunnels are all necessary for forming the level surface upon which the rails are to be laid, yet they are but the means for obtaining that end ; and the ultimate object for which these great works are constructed, and for which the enormous expenses consequent upon them are incurred...
Página 142 - He might doubtless delay the traffic, because he might not know which signal to lower for a particular train, but he could not lower such a signal or produce such a combination of position of points (switches) and signals as would, if the signals were obeyed, produce a collision.
Página 348 - ... the sides of the cylinder is equal to the pressure of the steam within the cylinder. The orifice through which the piston rod works in the end of the cylinder is also made steam tight by the use of packing. Speaking on this subject, an authority on such matters says: "The piston is made steam tight against the side of the cylinder by elastic metallic packing. Many kinds of metallic pistons are in use, but I know of none so good, for locomotive purposes, as that simple one invented by Mr. Eamsbottom,...
Página 349 - ... steam leak in at any part between the surface of the ring and the interior of the cylinder, it will press upon the ring, drive it backward, and will pass on; but this pressure is a pressure per inch of surface, therefore the less surface there is in contact, the less will be the actual pressure, and the less, therefore, will be the actual friction; obviously, for these reasons, it is desirable to diminish the width of the bearing surface of the rings as much as possible in practice, and that...
Página 142 - Station, for example, where there are nearly 70 point and signal levers concentrated in one signal house, the number of combinations which would be possible if all the signal and point levers were not interlocked can be expressed only by millions. Of these only 808 combinations are safe, and by the interlocking apparatus these 808 combinations are rendered possible, and all the others impossible. If a man were to go blindfold into...