Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green & Company, 1893 - 519 páginas |
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air-current air-road anemometer angle bars beds bore-hole boring bottom brattice brick cage capstan Carboniferous centre chisel clinometer coal measures coal-dust Coal-field colliery compressed cubic cubic foot cylinder Davy lamp depth dirt distance drill driven drum electric engine explosion feet fire-damp flame flange foot friction furnace gauze ground haulage hole hoppet horizontal inches in diameter incline iron ironstone joints lamp length lifted limestone load longwall lower machine mineral mines Oolite outcrop pass pillars pipe piston pit-bottom plate plumb-bob props pulley pump road rocks rods roof rope rule safety-lamp sandstone screw seam of coal shaft shale shown in Fig shows side sinking sometimes South Wales speed spur-gearing square inch Staffordshire stalls steam steel stone strata stroke surface temperature thick timber tons tubbing tube upcast valves veins velocity vertical waggons wedge weight wheel wire yards
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Página 518 - Crown 8vo. , 2s . 6d. GEOMETRICAL DRAWING FOR ART STUDENTS. Embracing Plane Geometry and its Applications, the Use of Scales, and the Plans and Elevations of Solids, as required in Section I.
Página i - City and Guilds of London Institute. With 199 Diagrams. 8vo. 12s. net. LUPTON— Mining : an Elementary Treatise on the Getting of Minerals. By ARNOLD LUPTON, MICE, FGS, &c., Mining Engineer, Certificated Colliery Manager, Surveyor, &c.
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Página 322 - The results found in this way, separately for white and colored persons of each sex, are shown in the table on the following page. It will be observed that most of the causes of death are selective in the age periods at which they are concentrated.
Página 113 - FIG. 442. work. This slide being say 18 inches long, the hole can be drilled that depth. When this depth is reached the screw is reversed, the drill drawn out of the hole, and a longer drill placed in the hole and fastened to the piston. The second drill is rather narrower than the first, so that it will not catch on the sides of the hole. When the entire length of this drill has been bored, if it is still necessary to go deeper, a third and then a fourth drill can be...
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Página 113 - ... work. This slide being say 18 inches long, the hole can be drilled that depth. When this depth is reached the screw is reversed, the drill drawn out of the hole, and a longer drill placed in the hole and fastened to the piston. The second drill is rather narrower than the first, so that it will not catch on the sides of the hole. When the entire length of this drill has been bored, if it is still necessary to go deeper, a third and then a fourth drill can be added. Percussion drills may be used...
Página 46 - ... periphery. A portion of the circular line is called an arc, eg abc (fig. 39). The size of an arc with reference to the whole circumference is measured by degrees. Every circle is divided into 360 equal parts, which are called degrees ; each degree contains 60 minutes, and each minute 60 seconds.
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