Electrical Engineer's Pocket-book: A Hand-book of Useful Data for Electricians and Electrical Engineers...Van Nostrand., 1902 - 987 стор. |
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alternating current aluminum ammeter amperes angle apparatus armature core average battery brushes cable candle-power capacity carbon cell cent centimeters Circular Mils coefficient coil commutator condenser conductors connected constant continuous current copper wire core loss cost curve deflection delta connection determined diameter direction distance drop dynamo eddy currents efficiency Electric electrical conductors equal exciting current feeders feet field flux following diagram formula frequency friction full load galvanometer Gauge grade heat hysteresis increase induction motors insulation resistance iron lead length light lines of force machine magnetic circuit maximum measured method miles per hour needle Nickeline number of poles ohms output phase potential pound power factor primary Railway ratio reactance reading rheostat ring sample secondary self-induction separately excited shunt single-phase speed square inch standard switch temperature terminals three-phase tion torque tractive transformers unit varies voltage voltmeter volts wattmeter watts weight winding wound zinc
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Сторінка 420 - per hour. It is also practically equivalent to an evaporation of 30 pounds of water from a feed-water temperature of 100° F. into steam at 70 pounds gauge pressure.* The present Committee accepts the same standard, but reverses the order of two clauses in the statement, and slightly modifies them to read as follows : The
Сторінка 449 - the amount of coal left on the grate as nearly as it can be estimated ; note the pressure of steam and the water level, and note this time as the time of starting the test. Fresh coal which has been weighed should now be fired. The ashpits should be thoroughly cleaned at once
Сторінка 387 - made that the conduit will not be injured. The radius of the curve of the inner edge of any elbow not to be less than three and one-half inches. Must have not more than the equivalent of four quarter bends from outlet to outlet, the bends at the outlet not being counted.
Сторінка 449 - same condition, on the grates, as at the start. The water level and steam pressures should previously be brought as nearly as possible to the same point as at the start, and the time of ending of the test should be noted just before fresh coal is fired. If the water level is not
Сторінка 420 - this standard in language of which the following is an extract : " Your Committee, after due consideration, has determined to accept the Centennial standard, and to recommend that in all standard trials the commercial horse-power be taken as an evaporation of 30 pounds of water per hour from a feed-water temperature of 100° F. into steam at
Сторінка 407 - for strength of girders and columns to express the effect of the form, is its moment of inertia about its neutral axis. Thus the moment of resistance of any section to transverse bending is its moment of inertia divided by the distance from the neutral axis to the fibers farthest removed from the axis ; or
Сторінка 377 - e. Must be provided with fuses, the rated capacity of which does not exceed the allowable carrying capacity of the wire ; and, when circuitbreakers are used they must not be set more than about thirty per cent above the allowable carrying capacity of the wire, unless a fusible cutout is also installed in the circuit (see No.