The School of Mines Quarterly, Volume 17Columbia University, 1896 |
Contents
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Common terms and phrases
acid Address unknown amount analyses andesites angle Assayer assays Assistant Engineer Assistant Superintendent augite Avenue basalt biotite boiling Brooklyn building carbonate cent Chem chemical Chemist Chemistry coal Colo color Colorado Columbia College column Company containing Copper crucible crystalline crystals cupel Cyanide deposits determined diabase dikes dilute diorites dissolved Electric feet feldspar filter flues fume furnace gabbros Geol Geological gneisses Gold grams granite heat HNO3 hornblende igneous rocks iron jigs Jour knee braces lead leucite limestone Metallurgy metals metamorphism method Mexico microscope Mill Mineralogy minerals Mining Engineer nepheline orthoclase peridotites phonolites plagioclase plates platinum porphyritic practice precipitate present Professor pyroxene quartz rhyolites River sandstones schists School of Mines silica silver SiO2 slag Smelting solution South Steel Street stresses Survey syenites temperature tion titration trachytes truss vertical washed weighed West WILLIAM York City
Popular passages
Page 332 - These by-laws may be amended at the annual or at any stated or special meeting of the Association, but only by a vote of two-thirds of those present, and provided that ten days' notice in writing of the proposed amendment shall have been given to the Executive Committee, and also that notice of the same shall have been given by the Secretary in the notices of the meeting.
Page 39 - ... quantity, but the vast majority of rocks consist of two or more. The condition that a rock should form an essential part of the earth is introduced to bar out those minerals or aggregates, which, though important in themselves, are none the less insignificant as entering into the mass of the globe. Thus the sulphide ores, while locally often in considerable quantity, when broadly viewed are practically neglectable. Yet this is somewhat arbitrary and there are single minerals and aggregates that...
Page 444 - ... microscope tube as shown here. This form is not so convenient, as the " cap " nicol must be set by hand every time it is desired to make observations with crossed n.cols. But at the same time it avoids any possible refocusing which may be necessary when the other type of analyser is introduced in the tube. the tube, the analyser is introduced in the line of sight between the objective and the observer's eye, with its plane of vibration at right angles to the plane of vibration of the polarizer;...
Page 332 - Any member of the Association may be suspended or expelled for misconduct in his relations to this Association or in his profession on conviction thereof in such manner as may be prescribed by the...
Page 273 - Thus, if we have a current of the proper velocity it will be able to lift a grain of quartz a sixteenth of an inch in diameter ; but if the velocity is doubled, the transportable particle will be four inches in diameter. An appreciation of this law makes the size of boulders moved by many streams, in times of flood, less surprising. On the other hand, when the suspended material becomes excessively fine, the ratio of its surface to its volume is so extremely high that adhesion, or chemical action...