Physical Review Volume 24

Physical Review Volume 24

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...pieces, as shown in the figure, and the two parts are held together by a strong rubber band (not shown) and kept from sliding sidewise by the pins 55. The face of the smaller section was filed, so as to always make a contact at the end of the block. This makes a satisfactory slide, free from contacts having strong thermo-electric power. It is necessary, however, to polish the wires with fine emery cloth before using. This is especially true of the copper wire; a small quantity of oxide making the resistance of the contact variable so that no satisfactory adjustment is possible. After a balance of the bridge was obtained the thermo-electric current in the galvanometer circuit was compensated and then again the final balance of the bridge made. The quantity of induced electricity passing through the galvanometer at the opening of the main circuit was compared with the quantity discharged from a standard condenser. The resistance of the galvanometer circuit was measured after each set of observations. The coefficients for two coils wound on the same spool were determined; and to test the accuracy of the values obtained, the coefficients of the two placed in series with the currents first in the same and then in opposite directions were determined as was also the coefficient of mutual induction. The following observations were common to all the self-induction determinations: t= 20.2 to 20.3 C. Ri = R4 = 99.99 ohms. A = 9.9966 ohms. R3 = 40.000 except in case of coil No. 2, where 3 = 10.014 ohms. E.M.F. of standard cell on potentiometer = 1.01869 (German) volts. E.M.F. of standard cell used for charging condenser = 1.01883 (German) volts. C--1.00136 x 10_s farads. Distance of straight scale = 127.2 cm. The remaining data are given in Table I....show more

Product details

  • Paperback | 152 pages
  • 189 x 246 x 8mm | 286g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236803485
  • 9781236803481