Electrical Measurements (Google eBook)

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McGraw-Hill, 1917 - Electric measurements - 719 pages
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Page 508 - Diversity factor is the ratio of the sum of the maximum power demands of the subdivisions of any system or parts of a system to the maximum demand of the whole system or of the part of the system under consideration, measured at the point of supply. Connected Load. The combined continuous rating of all the receiving apparatus on consumers...
Page 616 - K2 are rigidly connected and mounted on a radial arm, which is geared to the shaft so that it moves very slowly. The effect is to gradually move the contact point over the wave. The deflection of the galvanometer will at any instant be proportional to the PD between a and b at the instant of breaking at K2, or in other words, the deflection follows the wave form. The actual arrangement is shown in Figure 2 (see Plate), where the contact device, the synchronous motor, and the direct current motor...
Page 616 - ... the galvanometer will at any instant be proportional to the PD between a and b at the instant of breaking at K2, or in other words, the deflection follows the wave form. The actual arrangement is shown in Figure 2 (see Plate), where the contact device, the synchronous motor, and the direct current motor used for starting the apparatus will be seen. By use of worm gearing the wheel train necessary for moving the brushes is made very compact ; the reduction for the instrument shown is 7200 to 1....
Page vi - AE Kennelly, Professor of Electrical Engineering at Harvard University and the .Massachusetts Institute of Technology; Dr.
Page 438 - Burgess 12. On the Theory of the Matthews and the Russell-Leonard Photometers for the Measurement of Mean Spherical and Mean Hemispherical Intensities EP Hyde 13. The Testing of Clinical Thermometers . . CW Waidner and LA Fischer 14. Measurement of Inductance by Anderson's Method, Using Alternating Currents and a Vibration Galvanometer . EB Rosa and FW Graver 15.
Page 690 - ... The following test voltages shall apply unless a departure is considered necessary, in view of the above circumstances. Rubber covered wires or cable for voltages up to 7 kv. shall be tested in accordance with the National Electric Code. Standardization for higher voltages for rubber insulated cables is not considered possible at the present time. Varnished cambric and impregnated paper insulated wires or cables shall be tested at the place of manufacture for five (5) minutes in accordance with...
Page 438 - On the Power Factor and Conductivity of Dielectrics When Tested with Alternating Electric Currents of Telephonic Frequency at Various Temperatures.
Page 25 - The total moment acting to change the angular velocity of a body rotating about a fixed axis is the product of the moment of inertia and the angular acceleration.
Page 326 - N wires, the total power in the system is given by the algebraic sum of N wattmeters, so arranged that each of the N wires contains one current coil, the corresponding potential coil being connected between that wire and some point on the system which is common to all the potential circuits. If this common point is on one of the N wires and coincides with the point of...
Page 690 - ... of the wire or cable, and the assurance factor required, the latter in turn depending upon the importance of the service in which the wire or cable is employed 684 The following test voltages shall apply unless a departure is considered necessary, in view of the above circumstances. Rubber covered wires or cable for voltages up to 7 kv. shall be tested in accordance with the National Electric Code. Standardization for higher voltages for rubber insulated cables is not considered possible at the...

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