The Rudiments of Civil Engineering ...J. Weale, 1862 |
Términos y frases comunes
abutment action adopted angle arch ascertained atmosphere body brickwork canal carriage cast-iron cause center of gravity center of percussion chains channel Civil Engineering considerable construction curve deflexion depth diameter dimensions direction discharge distance docks drains effect engine equal equilibrium exposed feet flow fluid force frames friction graving docks greater ground horizontal inches inclination increase iron joints latter length liquid lock London clay lower manner masonry materials means miles per hour motion move multiplied observed orifice parallel passing piers pipes piston placed plane portion pressure principal proportional pump quantity radius rails railway reservoirs resistance river road sectional area shown in fig side slope sluices soffit specific gravity spring spring tides square stones strain strata stratum stream sufficient supported surface suspension bridges tides timber tion tube tunnel upper usually velocity vertical vessels vis viva voussoirs wall waves weight wheels whilst width
Pasajes populares
Página 40 - This accident it took nearly three years to repair ; a shaft of the depth of 53i metres had to be dug close to the bore, through all the most dangerous strata, and lined partly with sheet, and partly with cast-iron and masonry. Its diameter was three metres throughout the two-thirds of its depth, and 1'70 for the rest.
Página 41 - ... above the level of the sea the yield at Grenelle will again rise to its former figure, or nearly so. M. Elie de Beaumont has ascertained that the strata traversed at Passy are nearly the same as those met with at Grenelle. As to the chemical nature of the water at Passy, it seems, until further analysis, to be nearly the same as that of Grenelle ; the temperature is also the same, — viz., 28 degrees centigrade. Whether other wells may be bored elsewhere in Paris without injury to the two existing...
Página 40 - Castiron tubes, of the thickness of 35 millimetres (four-fifths of an inch), were starred or cracked in all directions, as if they were mere glass. More than once the workmen refused to risk their lives in this work, and the city engineers had to set the example of personal courage. This stupendous labour was not brought to an end before the 13th of December, 1859.
Página 40 - ... being free, stuck fast in such a way as to render all further progress nearly hopeless. However, M. Elie de Beaumont having, upon a mature examination of the specimens brought up by the borer, declared water to be close at hand, it was resolved that the bore should be continued with a small diameter, to be afterwards enlarged, if necessary. Water was found for the first time at 577| metres, but, as we know, remained a few metres below the level of the orifice.
Página 41 - New York gallons in 24 hours. M. Dumas attributes the diminution of the yield at Grenelle to a diminution of pressure, and is inclined to believe that when the tube at Passy shall have been brought to its normal altitude of 256 feet above the level of the sea, the yield at Grenelle will again rise to its former figure, or nearly so. M. Elie de Beaumont has ascertained that the strata traversed at Pussv are nearly the same as those met with at Grenelle.
Página 41 - The boring was now resumed, to attain the largest diameter, until the 24th of September last, when M. Kind saw not only his promise fulfilled, but even his hopes to a certain extent realized. The bronze tube has remained where it was, but the concentric one of sheet iron has sunk to -1,250 feet.
Página 97 - Calcutta, it rises about 5 feet, aud is transmitted at the rate of about 17£ miles per hour ; and in the Menga the rise is said to be 12 feet. The cause of the bore is universally considered to be owing to the interference with the transmission of the tidal wave, arising either from the sudden contraction of the embouchure of the river, or from the existence of some abrupt step or bar in the bed. The wave terminates abruptly on the inland side, because the quantity of water contained in it is so...
Página 73 - Fig, 70. gh portions of the short line branching from it, all of which are immovably fixed in the ordinary man.ner, with the exception of the two. rails fi and k I; these, which are termed the tongues of the switch, are only fixed at one of their ends,/- and k, on which they turn as...
Página 151 - The motion was observed to be greatest about half way between the pyramids and the centre of the bridge. The wave increased in its progress from the pyramid till it attained its maximum altitude near the first quarter, and at the same instant the extreme depression was near the third quarter. The wave then gradually diminished to the centre of the bridge and afterwards increased to the third quarter, when it attained its greatest height at the same time that the first quarter was most depressed....
Página 28 - ... polings should be placed a few inches above the top of the tunnel. As soon as a length of brickwork has been got in on each side of. the shaft, the temporary timber work of the lower portion of the shaft should be carefully removed, the ground excavated to the true form of the tunnel, and the brickwork introduced ; being securely bonded with and connected to that already built on either side, and the brickwork of the shaft being carried down to meet that of the tunnel. When this has been properly...