Transactions

Voorkant
Vols. for 1919- (v.60- ) include the proceedings of the Institute of Metals Division of the American Institute of Mining, Metallurgical and Petroleum Engineers.
 

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Pagina 136 - The expulsion of the pulp from a stamp-mill mortar. 1t is also used to designate the distance from the bottom of the screen to the top of the die, because this figure determines, more than any any other factor, the rapidity of the expulsion of the pulp.
Pagina lxxx - The duties of all officers shall be such as usually pertain to their offices, or may be delegated to them by the Council or the Institute ; and the Council may in its discretion require bonds to be given by the Treasurer.
Pagina lxxx - All vacancies shall be filled by the appointment of the Council, and any person so appointed shall hold office for the...
Pagina 200 - Gash-veins may cross the formation at any angle, but are limited to one particular group of strata, and are peculiar to the unaltered sedimentary rocks. True veins are aggregations of mineral matter, accompanied by metalliferous ores, within a crevice or fissure, which had its origin in some deep-seated cause, and which may be presumed to extend for an indefinite distance downwards.
Pagina lxxxii - Council shall have the power to decide on the propriety of communicating to the Institute any papers which may be received, and they shall be at liberty, when they think it desirable, to direct that any paper read before the Institute shall be printed in the Transactions. Intimation, when practicable, shall be given at each general meeting of the subject of the paper or papers to be read and of the questions for discussion at the next meeting, and notice thereof shall be posted to all members.
Pagina lxxxii - This constitution may be amended at any annual meeting by a two-thirds...
Pagina lxxx - To promote the arts and sciences connected with the economic production of the useful minerals and metals, and the welfare of those employed in these industries by all lawful means...
Pagina 594 - ... ground-water lying below water-level is not stagnant, but descends by capillarity, and since it cannot be simply consumed in depth, receives there through a higher temperature a tendency to return towards the surface, which tendency is most easily satisfied through open channels. Stated summarily:* The ground-water descends in the deep regions also through the capillaries of the rocks ; at a certain depth it probably moves laterally towards open conduits, and, reaching these, it ascends through...
Pagina 225 - Sometimes, it is said, the rock- fragments are cemented together with massive cinnabar, and kernels of rock crusted with cinnabar occur frequently. Hot mineral water and gases carrying H2S force their way through the interstices of the deposit, as was the case observed in the upper zones. The silica deposits are found in all stages of consolidation, from a gelatinous mass to chalcedony, and (Le Contc, op.
Pagina 211 - ... towards the deepest point of the surface of the region, or towards a point where an impermeable rock outcrops. The ground-water is not stagnant, but moves, though with relative slowness, according to the difference in height and the size of the interstitial spaces, down the plane mentioned, and finds its way, in the first instance, directly into the nearest surface-stream, or, in the second instance, forms a spring, which takes indirectly a similar course.

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