The School of Mines Quarterly, Том 18Columbia University, 1897 |
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acid air cylinder alternating current Alumni ammonia amount amperes angles axes axis boiling cent Chem chemical Chemist Chemistry circuit Columbia Columbia University compressed air compressor conductors connected cooling copper crystals determined diagrams diameter dilute direct current dissolved dome drop dynamo electrical engine evaporate excess faces feeders feet filter furnace give heat HNO3 inches indices iron lamps lime loss machines matte metal Metallurgy method mortar motor neutral obtained oxidized PINACOID pipe piston planes of symmetry pole poppet valves practice precipitate present pressure Professor pump Puzzolana rails resistance RHOMBOHEDRON rotary converter School of Mines separate shaft silica slag smelting soluble solution steam Steel stroke sulphide temperature three-wire system tion titrate track Trades Rev Trass tube two-wire circuit University vertical voltage volts volume wash weigh wire York City zone
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Сторінка 101 - W, we find that the most economical area of conductor is that for which the annual cost of energy wasted is equal to the annual interest on that portion of the capital outlay which can be considered to be proportional to the weight of metal used. Professor George Forbes, in his Cantor Lecture, on " The Distribution of Electricity...
Сторінка 120 - 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.
Сторінка 328 - But for long distances the application of these laws becomes somewhat complex. In addition to the factors just given, it is necessary to take into account the volume and pressure of the air, and the difference between the pressures at the receiver and at the end of the pipe line.
Сторінка 65 - could not increase either my fame or my happiness. It might undoubtedly enable me to put four horses to my carriage ; but what would it avail me to have it said that Sir Humphry drives his carriage and four?
Сторінка 118 - 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...
Сторінка 65 - No ! my good friend, I never thought of such a thing : my sole object was to serve the cause of humanity; and if I have succeeded, I am amply rewarded in the gratifying reflection of having done so.
Сторінка 148 - DC [ABSTRACT.] THE question as to the conditions which exist In the interior of the earth has always attracted much attention. The most important factor in the solution of this riddle is the determination or estimation of the temperatures there existing. The British Association has, for years, seized every opportunity to obtain data as to the rate at which the 'temperature increases as the earth's crust is penetrated. The most recent and reliable contributions on this subject are by Mr. E. Dunker...
Сторінка 373 - ... itself, and on the same side of the system as the conductor that is open. These lamps will light up when the motor is connected, but the motor will have little or no power unless the number of lamps is large. (c) If the neutral or middle wire is open, a motor connected with the outside wires will run as usual; but lamps on one side of the system will burn more brightly than those on the other side, unless the two sides are perfectly balanced.
Сторінка 102 - This heat is an absolutely definite and unavoidable result of the flow of the current. Its effect is to raise the temperature of the conductor, and this rise continues until the rate at which heat is lost equals the rate at which it is generated ; then the temperature becomes constant. It is obvious, therefore, that any electrical conductor is only capable of carrying a certain current with a given elevation of temperature, and in practical work the allowable temperature is limited by considerations...
Сторінка 268 - The law of symmetry may also be said to be based on a law of Delisle. " Every face has a similar face parallel to it." * De Formis Crystallorum cited in von Kobell's Geschichte der Mineralogie.