Transactions of the American Institute of Electrical Engineers, Volume 31American Institute of Electrical Engineers., 1912 - Electric engineering "Index of current electrical literature" Dec. 1887-1890 appended tov. 5-7. |
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Results 1-5 of 100
Page 4
... capacity is now an accomplished fact . One important feature of the hoisting problem is the extremely wide variation in the power demand and the influence of the extreme hoisting peaks upon the transmission line , or the entire station ...
... capacity is now an accomplished fact . One important feature of the hoisting problem is the extremely wide variation in the power demand and the influence of the extreme hoisting peaks upon the transmission line , or the entire station ...
Page 8
... capacity as to work practically all of the time when steady hoist- ing occurs , the boiler being used to store air while the hoist is out of service , and to supply the excess demand over and above the capacity of the compressor when ...
... capacity as to work practically all of the time when steady hoist- ing occurs , the boiler being used to store air while the hoist is out of service , and to supply the excess demand over and above the capacity of the compressor when ...
Page 11
... capacity . The accompanying charts show the general character of the load and while wide fluctuations occur , they will in the main 1000 800 600 400 200 11 A. M. 1000 CAPACITY OF GENERATORS 1092 AMP 800 10 A. M. 1600 400 200 FIG . 3 ...
... capacity . The accompanying charts show the general character of the load and while wide fluctuations occur , they will in the main 1000 800 600 400 200 11 A. M. 1000 CAPACITY OF GENERATORS 1092 AMP 800 10 A. M. 1600 400 200 FIG . 3 ...
Page 13
... capacity of the generators or the mo- mentary swing of the ammeter as indicated in one of the accom- panying charts . Careful tests on four typical plants in Ohio show the following : Average cost of power Cost for substation equipment ...
... capacity of the generators or the mo- mentary swing of the ammeter as indicated in one of the accom- panying charts . Careful tests on four typical plants in Ohio show the following : Average cost of power Cost for substation equipment ...
Page 14
... capacity installed in the central station for this service as proves to be the case with the isolated plant , as , for instance , it is shown that the maximum demand in one or two of the cases does not reach the total station capacity ...
... capacity installed in the central station for this service as proves to be the case with the isolated plant , as , for instance , it is shown that the maximum demand in one or two of the cases does not reach the total station capacity ...
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Common terms and phrases
alternating current alternating-current amount amperes apparatus armature automatic automatic call distributing average braking C₁ cable capacity cars cent central station circuit coal coil commutator conductors connection cost curve direct current direct-current distribution duct dynamic braking efficiency electric electrodes electromotive force energy engineers equipment field flux frequency full load Gano Dunn given heating hoist increase induction motor installation insulator isolated plant kilovolts kilowatt kilowatt-hour kw-hr lamps lighting lightning arrester load factor loss machine magnetic manhole maximum mill obtained operation ozone paper pole potential power factor practically private branch exchange private exchange railroad railway reactance relay resistance rheostat rotor secondary sheath shows single-phase slot speed stator steam street substation supply switch switchboard synchronous motor temperature three-phase tion torque transformer transmission line trolley units voltage volts winding wire
Popular passages
Page 1024 - The author is disposed to adopt the hypothesis of an electrical plenum, and from the foregoing experiment it would appear that the transfer of a single spark is sufficient to disturb perceptibly the electricity of space throughout at least a cube of 400,000 feet of capacity...
Page 1023 - But be this as it may, the fact that the magnetic action of a current from a trough is at least not sensibly diminished by passing through a long wire, is directly applicable to Mr. Barlow's project of forming an electromagnetic telegraph ; * and it is also of material consequence in the construction of the galvanic coil.
Page 1021 - Professor Henry has been enabled to produce a magnetic force which completely eclipses every other in the whole annals of magnetism; and no parallel is to be found since the miraculous suspension of the celebrated oriental impostor in his iron coffin."* The first Electro-magnetic Engine.
Page 1225 - A considerable part (perhaps as much as onethird) of the energy delivered to the tube is transformed into heat at the point where the cathode rays bombard the target. Where platinum is used it has been found necessary, to prevent melting, to place the target beyond the focus of the cathode so as to spread the bombardment over a larger area. As a radiograph is a shadow picture, and as the source of the...
Page 609 - Divide the area by .7854 and extract the square root of the quotient ; the result is the diameter.
Page 616 - A," and the speed regulation of "D" is poor. STARTING WITH VARIABLE SECONDARY RESISTANCE Fig. 7 represents the conditions of speed, current, etc., when a variable secondary resistance is used at start. The motor starts at "F" on curve "D," and takes a current "G." The current falls to "H," while the speed rises to "i," which corresponds to the normal torque "T" at which the motor will run under the given conditions as long as the motor operates on curve "D.
Page 269 - The average load of 44,220 kw. was apportioned among the various roads operating in the city. (2) The results were increased, so as to apply to the Association of Commerce electric zone instead of the city limits. (3) A study was made of the movement of freight cars during the different hours of the day, and the different months of the year. The increased traction on account of cold weather was also considered. The daily, monthly and yearly load factors were thus obtained. (4) The maximum demand...
Page 1224 - Rontgen tube. With the advent of dense, forged pieces of pure malleable tungsten, the possibilities of the Rontgen tube are greatly extended. The desiderata in a material to be used as the anticathode or target are the following : 1. High specific gravity. 2. High melting point. 3. High heat conductivity. 4. Low vapor pressure at high temperature. The reasons why the above qualities are desirable follow readily from a brief consideration of the theory of Rontgen-ray production. From the concave cathode,...
Page 399 - I do not know that I can add anything to what has been already said in the text of the Lecture on this point.
Page 1225 - Roentgen tube is of the utmost importance, as the character of the rays is so largely determined by the vacuum. Metal, which under the influence of the high temperature vaporizes from the target, condenses on the glass in finely divided form and absorbs relatively large amounts of gas, thus changing the vacuum. At high temperatures tungsten vaporizes least of all the metals. Two distinct types of tungsten target are being tried out experimentally in competition with one another. The first of these...