Useful Information for Engineers: Being a Series of Lectures

Copertina anteriore
 

Parole e frasi comuni

Brani popolari

Pagina 67 - In conclusion, I have to thank you for the patience with which you have listened to these remarks.
Pagina 71 - It is hardly possible to avoid associating our conception of an object of definite globular figure, and of such enormous dimensions, with some corresponding attribute of massiveness and material solidity. That the sun is not a mere phantom, but a body having its own peculiar structure and economy, our telescopes distinctly inform us. They show us dark spots on its surface, which slowly change their places and forms, and by attending to whose situation, at different times, astronomers have ascertained...
Pagina 323 - Fairbairn.— Useful Information for Engineers : Being a Series of Lectures delivered to the Working Engineers of Yorkshire and Lancashire. With Appendices, containing the Results of Experimental Inquiries into the Strength of Materials, the Causes of Boiler Explosions, &c. By WILLIAM FAIEBAIEN, FRS, FGS Second Edition ; with numerous Plates and Woodcuts.
Pagina 239 - practical men ought to have known that the cable was defective, and to have been aware of the locality of the defects before it was laid.
Pagina 268 - To determine by direct experiment the mechanical properties of every cable submitted for submergence in deep water; 2nd. To ascertain the chemical properties of the insulator, and the best means to be adopted for the preservation and duration of the cable ; and, 3rd. To determine the electrical properties and conditions of the cable when immersed under pressure at great depths.
Pagina 228 - The two upper bolts of those connecting brackets to ribs serve for fixing the wind ties, the ends of which are flattened down in the usual way, and have right and left-hand screws for adjustment. In addition to the Dublin Exhibition roof, Mr. Carl Wessely selected the arched roof over the Derby Market, figs. 37 and 38, for illustration. It is 86 feet 6 inches span, of the semicircular form, and the principals consist of wrought-iron arched ribs, the inner and outer curves being true circles struck...
Pagina 74 - Since the earth revolves about an axis passing through the poles, the equatorial portion of its surface has the greatest velocity of rotation, and all other parts less in the proportion of the radii of the circles of latitude to which they correspond. But as the air, when relatively and apparently at rest on any part of the earth's surface, is only so because in reality it participates in the motion of rotation proper to that part, it follows...
Pagina 84 - ... already shown that the temperature increases in the ratio of the depth as we penetrate below the earth's surface; and, having ascertained the melting point of any solid body at the pressure of the atmosphere, we had then to determine, by the apparatus just described, the effect that greatly increased pressure had upon the material at different degrees of temperature. For this purpose we commenced with substances such as spermaceti, bismuth, &c., which melt at a low temperature; and, by means...
Pagina 102 - Fourth, the subsequent disengagement of a large quantity of steam from the heated water now no longer confined within the boiler, and the consequent projection of the already separated parts of the boiler to a greater or less distance.
Pagina 80 - The sea is constantly beating on the land, grinding it down, and scattering its worn-off particles and fragments, in the state of mud and pebbles, over its bed. Geological facts afford abundant proof that the existing continents have all of them undergone this process, even more than once, and been entirely torn in fragments, or reduced to powder, and submerged and reconstructed.

Informazioni bibliografiche