Transactions of the Association of Civil Engineers of Cornell University: 1892-1896, Volums 1-41893 |
Altres edicions - Mostra-ho tot
Transactions of the Association of Civil Engineers of ..., Volum 21,Edició 3 Visualització completa - 1912 |
Transactions of the Association of Civil Engineers of Cornell ..., Volums 10-13 Visualització completa - 1902 |
Transactions of the Association of Civil Engineers of Cornell ..., Volums 26-27 Visualització completa - 1917 |
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Passatges populars
Pàgina 21 - Engineer, being the art of directing the great sources of power in Nature for the use and convenience of man...
Pàgina 29 - Far away, and in all directions, run the pipes under the city pavements. I discovered that these pipes were furnishing water by special branches to all whom they passed and who had been able to arrange for it; being bored for that purpose here and there, by the so-called tappers ; whence it came, that only a small quantity of water reached the places of public supply. The amount of water gained in consequence of our abatement of this evil, I measure by means of the fact that we have gathered a large...
Pàgina 18 - Emperor of whom it is difficult to say whether he devotes more love or more diligence to the common weal, has now conferred upon me the duties of Water Commissioner, duties contributing partly to the convenience, partly to the health, even to the safety, of the city, and from olden time exercised by the most distinguished citizens. I therefore consider it to be the first and most important thing to be done, as has always been one of my fundamental principles in other affairs, to learn thoroughly...
Pàgina 10 - ... the Mississippi, because it does not explain why it is that under certain conditions of the water it may develop, with a gentle current, an abrading power which, under other conditions, a great velocity cannot exert at all. A certain velocity gives to the stream the ability of holding in suspension a proportionate quantity of solid matter; and when it is thus charged, it can sustain no more, and hence will carry off no more, and therefore cannot then wear away its bottom or banks, no matter how...
Pàgina 10 - ... in conception, so lacking in verification. But twenty years later, when Picard's length of a degree was made known, increasing the diameter of the earth by about a thousand miles, Newton was able to show that the deflection of the orbit of the moon from a straight line was equivalent to a fall of 16 feet in one minute, the same distance through which a body falls in one second at the surface of the earth. The distance fallen being as the square of the time, it followed that the force of gravity...
Pàgina 17 - That the bottom of the river is in an unstable condition and constantly in a state of motion ; the amount of material thus moving along the bottom in waves depends oil the velocity of the current and the depth of water, being the greatest when fron...
Pàgina 27 - Saldae, the contractor and his assistant had committed blunder upon blunder. In each section of the tunnel they had diverged from the straight line each towards his right, and had I waited a little longer before coming, Saldae would have possessed two tunnels instead of one.
Pàgina 62 - ... of the dam may be reduced below what is termed the gravity section, meaning thereby a crosssection or profile of such proportions that it is able, by the force of gravity alone, to resist the forces tending to overturn it or to slide it on its base at any point. (2) That a gravity dam, built, in plan, on a curve of long radius, derives no appreciable aid from arch action so long as the masonry remains intact ; but that, in case of a yielding of the masonry, the curved form might prove of advantage....
Pàgina 29 - From the foundation of the city for 441 yearsf the Romans were content with the use of the waters which they drew either from the Tiber, or from wells, or from springs. Springs have held, down to the present day:}: the name of holy things, and are objects of veneration, having the repute of healing the sick; as, for example, the Springs of the Camenae (Prophetic Nymphs), of Apollo, and of Juturua. But there now run into the city: the Appian aqueduct, Anio Vetus, Marcia, Tepula, Julia, Virgo, Alsietina...
Pàgina 27 - ... the success of the work. What could I have done better? I began by surveying and taking the levels of the mountain; I marked most carefully the axis of the tunnel across the ridge; I drew plans and sections of the whole work, which plans I handed over to...