Electrical measurementsA laboratory manual . mpsin another. Two resistance boxes, A and B, were in the otherarms. Call the resistance of the lamps R. Then if r and r arethe resistances of the two solutions, r^R^\ r = R^.B B Whence h j,A B Observation!^: With standard solution. A B AB 290 2000 .1450 2G8 1800 .1461 219 1500 .1460 Temperature ° ; k = 2180 X 10 BESISTANCK 113 Electrolyte. Temp. Spec. Gray. A B ABBA Conductivity. ZnSOi at 147017542053 100012001400 .0992 216 X 10-^^ ZnSOi 18. at » 73710991484 100015002000 .197 430 X 10-^^ CuSOi °
Electrical measurementsA laboratory manual . mpsin another. Two resistance boxes, A and B, were in the otherarms. Call the resistance of the lamps R. Then if r and r arethe resistances of the two solutions, r^R^\ r = R^.B B Whence h j,A B Observation!^: With standard solution. A B AB 290 2000 .1450 2G8 1800 .1461 219 1500 .1460 Temperature ° ; k = 2180 X 10 BESISTANCK 113 Electrolyte. Temp. Spec. Gray. A B ABBA Conductivity. ZnSOi at 147017542053 100012001400 .0992 216 X 10-^^ ZnSOi 18. at » 73710991484 100015002000 .197 430 X 10-^^ CuSOi ° at ° 184013771155 800600500 .0633 138 X 10-^^ 60. Resistance of Electrolytes — Second Method.— Instead of a double commutator and a galvanometer,an induction coil ora sine inductor andan electrodynamome-ter (Art. 67) may beemployed. This is themethod of the induction coil isused it should be onewith a solid iron core,to avoid the greatdifference in the valueof the direct and in-verse currents due to a wire Let I be the induc-tor (Fig. 50), U the ^^- °-electrodynamometer, M a post-office bridge, and V theelectrolyte. The electrolytic resistance is one arm ofthe bridge. Tlie fixed coil of the electrodynamometeris in series with the main current, while the movable coil Professor Daniel, Physical Rev., Vol. I., No. 4, p. 241. 114 ELECTRICAL MEASUREMENTS. is connected in place of the galvanometer to the twoends of the proportional coils, a and b. By this meansresistances can be measured to several significant sensibility is increased by increasing the current andshunting the bridge by a suitable resistance c d. The sine inductor may be used in place of the induc-tion coil. It may consist of a stationary Gramme ring,
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