The Annual of Scientific Discovery, Or, Year-book of Facts in Science and ArtGould, Kendall, and Lincoln, 1851 |
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Página 21 - ... the magnitude of the blow in each set of experiments being made greater, or smaller, as occasion required. The general result obtained was, that when the blow was powerful enough to bend the bars through one-half of their ultimate deflection...
Página 21 - ... of the ultimate deflection, the bars were not weakened. This was ascertained by breaking them in the usual manner with stationary loads in the centre. When, however, the depressions produced by the machine were made equal to one half of the ultimate deflection, the bars were actually broken by less than 900 depressions.
Página 309 - A good general idea may be formed of its shape and size by conceiving it as the pointed half of a small hen's egg, though it is said not to have risen more than half an inch from the gold setting in which it was worn by Runjeet. Its value is scarcely computable, though two millions sterling has been mentioned as a justifiable price, if calculated by the scale employed in the trade. The Pitt diamond brought over from Madras by the grandfather of Lord Chatham, and sold to the...
Página 130 - The effect of the increased thickness is obviously to improve the insulation of the carpet. The carpet must be quite dry, and also the floor of the room, so that the fluid may not be conveyed away as soon as it is excited. This will not generally be the case except in winter, and in rooms which are habitually kept quite warm. The most remarkable cases which I have heard of in New York have been of close, well-built houses, kept very warm by furnaces ; and the electricity was most abundant in very...
Página 26 - That as it has appeared that the effect of velocity communicated to a load is to increase the deflection that it would produce if set at rest upon the bridge; also that the dynamical increase in bridges of less than 40 feet in length is of sufficient importance to demand attention, and may even for lengths of 20 feet become more than one-half of the statical deflection at high velocities, but can be diminished by increasing the stiffness of the bridge...
Página 105 - Yard, was an upright engine of two feet stroke; and in order to have facilities for comparative trials and experiments, it was necessary that a double engine should be made, the two parts exactly corresponding. Two bars of soft iron, six inches diameter and three feet in length, were the prime movers, and these were balanced by means of connecting rods and cranks upon a fly-wheel shaft. The balance wheel and shaft together weighed six hundred pounds.
Página 267 - The bottom of this stream is an inclined plane, running upwards. If the Gulf Stream was 200 fathoms deep in the Florida Pass, and but 100 fathoms off Hatteras, it is evident that the bottom would be uplifted 100 fathoms within that distance, and...
Página 20 - Brunei, however, thinks the various appearances of the fracture depend much upon the mode in which the iron is broken. The same piece of iron may be made to exhibit a fibrous fracture when broken by a slow heavy blow, and a crystalline fracture when broken by a sharp short blow.