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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Page vii
... tion By Samuel Insull . ( Illustrated . ) . Discussion at New York , John W. Lieb , Jr. , Dugald C. Jackson , Charles P. Steinmetz , Lewis B. Stillwell , Benjamin F. Wood , Cary T. Hutchinson , Bion J. Arnold , Frank J. Sprague , Hans ...
... tion By Samuel Insull . ( Illustrated . ) . Discussion at New York , John W. Lieb , Jr. , Dugald C. Jackson , Charles P. Steinmetz , Lewis B. Stillwell , Benjamin F. Wood , Cary T. Hutchinson , Bion J. Arnold , Frank J. Sprague , Hans ...
Page 21
... tion of piping and valving to prevent some possible mishap often results in the trouble it is designed to prevent , as the valves and the mains begin to leak through cross expansion strains and neither line can be shut off ...
... tion of piping and valving to prevent some possible mishap often results in the trouble it is designed to prevent , as the valves and the mains begin to leak through cross expansion strains and neither line can be shut off ...
Page 47
... tion . Such conditions are not , therefore , favorable to the opera- tion of steam engines . I draw your attention to the fact that some of the diagrams of load curves presented omit a very essential element , the variations introduced ...
... tion . Such conditions are not , therefore , favorable to the opera- tion of steam engines . I draw your attention to the fact that some of the diagrams of load curves presented omit a very essential element , the variations introduced ...
Page 53
... tion of the cost per kilowatt - hour came up . As the plant con- tained hydraulic machinery for elevator operation it was neces- sary to segregate the elevator operating costs in order to obtain the cost per kilowatt - hour of electric ...
... tion of the cost per kilowatt - hour came up . As the plant con- tained hydraulic machinery for elevator operation it was neces- sary to segregate the elevator operating costs in order to obtain the cost per kilowatt - hour of electric ...
Page 70
... tion . An equitable rate for carrying a ton of wheat from Chicago to New York City has very little relation to an equitable rate for carrying a ton of wheat twenty miles from a farm to a grain elevator ; likewise , there is very little ...
... tion . An equitable rate for carrying a ton of wheat from Chicago to New York City has very little relation to an equitable rate for carrying a ton of wheat twenty miles from a farm to a grain elevator ; likewise , there is very little ...
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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...