Spons' Dictionary of Engineering, Civil, Mechanical, Military, and Naval, Volume 2Edward Spon, Oliver Byrne, Ernest Spon, Francis N. Spon E. & F.N. Spon, 1870 |
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abutment acid angle applied arch arrangement axis battery boiler boring bottom brake carriages brakes bricks bridge Burr Truss cables cells centre charges circuit circulation clay combustion compression connected constructed copper curve cylinder diameter direction distance effect ellipsis employed engine equal experiments extrados fire fire-box flues force friction fuze girders gutta-percha heat hole horizontal horizontal action increase intrados iron ironstone kiln kilogrammes latent heat latter length lever liquid load lower chords machine magnetic means metal mètres motion nitric acid obtained parabola passing piers pipe piston placed plane plates platinum platinum wire portion pressure produced proportion quantity radius represented resistance result rods screw shaft shale shown in Fig side span steam sufficient sulphuric acid surface temperature tension thickness tons train truss tubes upper velocity vertical voussoirs weight wheel zinc
Popular passages
Page 575 - ... the other two perforations, which are parallel to each other on each side of the central one, and at right angles to it, serve for the reception of the circuit wires. The arrangement for securing the connection of these with the insulated wires in the fuzes is as follows : — The piece of double covered wire above referred to is originally of a sufficient length to allow of the gutta-percha being removed from about one-and-ahalf inches of the wires.
Page 473 - Fig. 10, is allowed to be lifted off its face by the pressure of the water, and lets the water flow past the pump direct through into the tubes. The fire is then lighted and steam raised from the water in the tubes, which starts the circulating pump to work. More water is forced through the tubes by the circulating pump than is evaporated in them. The circulating pump of the boiler now used for ten months is double-acting, 6 inches in diameter with 9 inches stroke, and makes 40 revolutions per minute...
Page 536 - ... situate at a greater distance occurs. The magnitude of the transition between two adjacent particles, under otherwise exactly similar circumstances, I have assumed as being proportional to the difference of the electric forces existing in the two particles ; just as in the theory of heat, the transition of caloric between two particles is regarded as proportional to the difference of their temperatures.
Page 440 - ... without producing smoke. No particular attention was required from the stoker, in fact, in this respect ; the system leaves nothing to desire, and the actual labour is even less than that of the ordinary mode of firing. Mr. Williams...
Page 578 - They were thus ready for insertion into the bag or other receptacle containing the charge of gunpowder, the ends of the covered wires protruding from the opening of the latter to a convenient distance for effecting the junction with the branch and earth-wires.
Page 440 - These results show a large increase above the standard in every respect. The prevention of smoke was, we may say, practically perfect, whether the fuel burned was 15 Ibs.
Page 621 - ... pulley. The friction pulley was made of great thickness for two reasons. When the pulley is heated, the arms cease to be in contact with the interior circumference of the pulley, consequently they would not prevent the pressure of the brake from altering the form of the pulley. This renders great stiffness necessary in the pulley itself. Again, it is found that a heavy friction pulley insures more regularity in the motion, operating, in fact, as a fly-wheel, in equalizing small irregularities....
Page 529 - A cotter, which keeps the clack in its place, is then knocked out, and the table screwed down. The bottom clack and the frame descending with it, the contents of the pump are washed out by the rush of water contained in the pump cylinder. The table is again raised by the screw, and the...
Page 541 - On the wood cylinder a spiral groove is cut, and at one of its extremities a brass ring is fixed, to which is attached one of the ends of a long wire of very small diameter, which when coiled round the wood cylinder fills the entire groove, and is fixed at its other end to the remote extremity of the brass cylinder. Two springs...
Page 529 - ... on the cam shaft whilst the percussive motion is in operation. The clam which grips the rope is fixed to a slide and screw, by which means the rope can be given out as required. When this operation is completed, and the strata cut up by...