A Glossary of the Mining and Mineral Industry

U.S. Government Printing Office, 1920 - 754 sider

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Side 358 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Side 469 - Ike current is directly proportional to the electromotive force and inversely proportional to the resistance.
Side 296 - Gas-House Coal Tar. — Coal tar produced in gas-house retorts in the manufacture of illuminating gas from bituminous coal.
Side 443 - A mining claim is a parcel of land containing precious metal in its soil or rock. A location is the act of appropriating such parcel, according to certain established rules.
Side 527 - Polymeric. Having the same elements united in the same proportions by weight, but with different molecular weights. ( Webster ) Polymerize. To change into another substance having the same elements in the same proportions, but a higher molecular weight. (Webster) Polymnite.
Side 347 - Hot Drawn. — A term used to signify the product of drawing, when the operation is performed on material that is hot — usually red hot ; eg, hot-drawn seamless tubes. The term is sometimes applied to the Mannesmann product that has not been drawn.
Side 635 - Specific gravity. The ratio of the weight of a body to that of an equal volume of some standard substance, water in the case of solids and liquids, air in the case of gases ; numerically equal to the density.
Side 606 - An excavation of limited area compared with its depth, made for finding or mining ore or coal, raising water, ore, rock, or coal, hoisting and lowering men and material, or ventilating underground workings. The term is often specifically applied to approximately vertical shafts, as distinguished from an incline or inclined shaft.
Side 155 - Chute. (Sometimes written shoot) 1. A channel or shaft underground, or an inclined trough above ground, through which ore falls or is "shot" by gravity from a higher to a lower level.
Side 210 - The ratio of the mass of any volume of a substance to the mass of an equal volume of some standard substance. For liquids and solids the standard substance Is water.

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