Transactions of the American Institute of Electrical EngineersAmerican Institute of Electrical Engineers., 1893 - Electric engineering "Index of current electrical literature" Dec. 1887-1890 appended to v. 5-7. |
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Page 15
... curve , is the surface integral of mag- netic induction taken over the bounded surface , and when produced by a current is also equal to the line integral of the vector potential of the current taken round the bound- ary . The uniform ...
... curve , is the surface integral of mag- netic induction taken over the bounded surface , and when produced by a current is also equal to the line integral of the vector potential of the current taken round the bound- ary . The uniform ...
Page 18
... curve from which the reading corresponding to the main current - time - average of the current -can be found . The current , as calculated by the voltameter , corresponds to this reading . THE CLARK CELL . Definition of the Cell . - The ...
... curve from which the reading corresponding to the main current - time - average of the current -can be found . The current , as calculated by the voltameter , corresponds to this reading . THE CLARK CELL . Definition of the Cell . - The ...
Page 37
... curve of registration which only needs to be integrated with a planometer to determine the consumption , al- ways supposing that the indicating device is correct . I have said , " only needs to be integrated . " How desirable a meter ...
... curve of registration which only needs to be integrated with a planometer to determine the consumption , al- ways supposing that the indicating device is correct . I have said , " only needs to be integrated . " How desirable a meter ...
Page 39
... curve - drawing meters , they can- not properly be considered as the thoroughly commercial article , which the successful electric meter must be . For , I think I am safe in assuming that to be successful the meter of to - day posi ...
... curve - drawing meters , they can- not properly be considered as the thoroughly commercial article , which the successful electric meter must be . For , I think I am safe in assuming that to be successful the meter of to - day posi ...
Page 51
... curve given to me and represented in the diagram , Fig . 4 , represents most likely the meter at its best , otherwise it would not have been made public . This curve is taken from a meter which is to register from half an ampere up to ...
... curve given to me and represented in the diagram , Fig . 4 , represents most likely the meter at its best , otherwise it would not have been made public . This curve is taken from a meter which is to register from half an ampere up to ...
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Common terms and phrases
alternating current AMERICAN INSTITUTE ampere ampere-hour armature average boilers calc calculated candle power capacity cent Centimetres circuit clock meter coal coil column Committee condenser considered copper cost curve cylinder device Diam dielectric difference of potential direct current discharge discussion DISRUPTIVE DISCHARGE dynamo economy effect elec Electrical Congress Electrical Engineer Electrician electrodes electromotive force electrostatic faradic Ferranti effect field formula frequency friction fuse galvanometer horse-power hysteresis impedance factor incandescent inches increase inductance INSTITUTE OF ELECTRICAL instrument insulation interest International Electrical Congress iron Kennelly lamp less light load machine magnetic meetings method motor meters obtained paper plant pole practical unit pressure Prof quantity resistance resonance secondary Secretary self-induction shunt sparking distance speed standard steam Table tests tion transformer vibrations voltage voltmeter volts water power watt-hour wattmeter watts wire York
Popular passages
Page 460 - As a unit of resistance, the international ohm, which is based upon the ohm, equal to 10* units of resistance of the Centimeter-Gramme-Second System of electro-magnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice 14.4521 grammes in mass, of a constant cross-sectional area, and of the length of 106.3 centimeters.
Page 460 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 15 - In the following specification the term silver voltameter means the arrangement of apparatus by means of which an electric current is passed through a solution of nitrate of silver in water. The silver voltameter measures the total electrical quantity which has passed during the time of the experiment, and by noting this time the time average of the current, or, if the current has been kept constant, the current itself, can be deduced. In employing the silver voltameter to measure currents of about...
Page 461 - IOT units of work in the cgs system, and which is represented sufficiently well for practical use by the energy expended in one second by an international ampere in an international ohm. " As a unit of power, the watt, which is equal to 10...
Page 18 - It is convenient to arrange the mounting so that the cell may be immersed in a water bath up to the level of, say, the upper surface of the cork. Its temperature can then be determined more accurately than is possible when the cell is in air. In using the cell sudden variations of temperature should as far as possible be avoided.
Page 17 - Contact is made with the mercury by means of a platinum wire about No. 22 gauge. This is protected from contact with the other materials of the cell by being sealed into a glass tube. The ends of the wire project from the ends of the glass tube ; one end forms the terminal, the other end and a portion of the glass tube dip into the mercury.
Page 16 - Prepare a neutral saturated solution of pure ("pure recrystallised ") zinc sulphate by mixing in a flask distilled water with nearly twice its weight of crystals of pure zinc sulphate, and adding zinc oxide in the proportion of about 2 per cent, by weight of the zinc sulphate crystals to neutralise any free acid. The crystals should be dissolved with the aid of gentle heat, but the temperature to which the solution is raised should not exceed 30° C.
Page 17 - Clean the glass tube and platinum wire carefully, then heat the exposed end of the platinum red hot, and insert it in the mercury in the test tube, taking care that the whole of the exposed platinum is covered. Shake up the paste and introduce it without contact with the upper part of the walls of the test tube, filling the tube above the mercury to a depth of rather more than 2 cm.
Page 17 - C. Keep the paste for an hour at this temperature, agitating it from time to time, then allow it to cool ; continue to shake it occasionally while it is cooling. Crystals of zinc sulphate should then be distinctly visible, and should be distributed throughout the mass ; if this is not the case, add more crystals from the stock bottle, and repeat the whole process. This method ensures the formation of a saturated solution of zinc and mercurous sulphates in water. To set up the Cell. The cell may conveniently...
Page 659 - College of the City of New York, 17 Lexington Ave., New York, NY Wunderlich, Frieda, vice dean, The New York School for Social Research, 66 W.