Transactions of the American Institute of Electrical Engineers, Volume 29American Institute of Electrical Engineers., 1910 "Index of current electrical literature" Dec. 1887-1890 appended tov. 5-7. |
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Common terms and phrases
abwatts advantage alternating current amount amperes apparatus armature automatic system average boiler calls calorimeter capacity carbon central station circuit coal commutator condensing conical drum connection considerable constant copper cost of power curves cycle diagram direct current direct-current drive drum economy efficiency electric power electric resistivity electrode engine equipment fahr flywheel furnace graphite heat high-pressure hoist motor horse power increase induction motor installed insulator isolated plant kilowatt kilowatt-hour kw-hr light line switches load factor located loss low-pressure turbine machine manual system manufacturing maximum necessary NOZZLE PRESSURE obtained operation output paper power plant practice produce reciprocating engine reduced resistance rheostat rope selector shaft short-circuit shows single-phase speed steam turbine subscriber substation supply switchboard synchronous telephone temperature textile mills thermal tion transmission trouble TRUNK LINES Turb unit variation voltage volts watts wire
Popular passages
Page 137 - Engineering may become affiliated with their respective national professional engineering societies, the American Society of Civil Engineers, the American Institute of Electrical Engineers and the American Society of Mechanical Engineers, as each of these organizations has authorized a student chapter at the University of Vermont.
Page 546 - Steffan's law, that the total radiation from a black body is proportional to the fourth power of the absolute temperature.
Page 250 - ... widely in others, which are of more or less importance, depending upon special conditions of individual cases. Fig. 1 gives the efficiencies, currents, and speeds of the directcurrent shunt-motor at various loads for constant impressed voltage, and Fig. 2 gives similar curves for the induction-motor, to which is added the power-factor curve. By reference to these curves it will be seen that the free-running speed of each motor is limited, and that the variations in speed with changes in load...
Page 482 - Many other interesting relationships are established, as shown in the following "laws of electrode losses" which are quoted directly from Dr. Hering's paper. l Laws of Electrode Losses a. The combined loss through the cold end of an electrode is equivalent to the sum of the loss by heat conduction alone2 (when there is no current) and half the C2R loss.3 b.
Page 494 - The best possible electrode efficiency for any material may be determined from the total voltage of the furnace and this minimum voltage due to the material and the temperature, and is independent of the dimensions. g. The temperatures indicated by the heat gradient of the combined flow are equal to the sums of those of the individual flows.
Page 247 - ... are entirely special, and can be considered only in connection with the peculiar conditions pertaining to that particular installation. The cost of installation of the hoisting-plant may be an appreciable amount, while the cost of raising the ore may be but a small part of the total operating-charge. In many cases, however, the output of the mine is limited by the capacity of the hoist, and the latter thus becomes of the first importance. * Presented also, by mutual agreement, at the meeting...
Page 247 - ... observed, they introduce factors which qualify the conditions of hoisting men and ore. The amount of timbering required is often of importance as relating to hoistingconditions. Methods of loading ore affect the time required, as also does the question of the use of cars or skips. Safetyprecautions must be very carefully considered, and the number of men in each mine, the number of compartments, and often the method of removing water from the mine, must have careful consideration. While a general...
Page 286 - ... reduction in the labor, the cost of which is chargeable against the hoist. This may amount to the wages of one or two men in the boilerhouse if power is developed by the mining company, or of the whole boiler-house force if power is purchased, and frequently the wages of one man in the hoist-house. So many factors which vary between wide limits for different localities enter into the comparative costs of hoisting electrically and by steam, that each individual case must be treated by itself;...
Page 269 - ... with other systems. The efficiency of the cycle increases with an increased rate of acceleration, from which it follows that an induction motor for hoisting should be designed for a high maximum output to permit of a rapid acceleration. The power returned to the system when lowering the empty skip unbalanced is shown by the right hand curves of Fig.
Page 143 - The tungsten lamp has practically revolutionized commercial lighting and is now being extensively adopted in industrial lighting, especially in textile mills. It is by far the most efficient of the incandescent class, and while the maintenance seems high in some cases, it is being rapidly reduced with the progress of development. Where lamps are protected from excessive vibration or shock, the tungsten is giving an exceedingly long burning life. In choosing between tungsten and tantalum, the cost...