Verdet’s constant

C. Montemartini and L. Losana observed a break in the expansion curve of soln. of chromium nitrate. L. R. Ingersoll found for Verdet s constant for the electromagnetic rotatory power for light of wave-length 0-8, 1-0, and l-25p, respectively 0-0066,0-0041, and 0-0025 for soln. of chromic nitrate of sp. gr. 1-087. W. N. Hartley found that two violet soln. of the nitrate showed absorption bands respectively between 5880 and 5570, and 5650 and 5070. The violet soln. becomes green when heated. According to 0. Knoblauch, the absorption spectrum of the soln. has a faint band at 6670, and a band between 6160 and 5770, with a small absorption at 513. When the soln. is diluted the band moves to 6180 to 5920. J. M. Hiebendaal observed a band between 6130 and 5320, and absorption from 4540. The addition of ammonium chloride weakens the band, and produces a narrow band at 6370 in alcoholic soln., there is a narrow band at 6370 a band between 6550 and 5350, with a maximum between 6130 and 5500 and absorption from 4600. A. fitard found bands between 6780 and 6700, and between 6540 and 6330. The spectrum was also examined by A. Byk and H. JafEe. The electrical conductivity of soln. of the nitrate was measured by H. C. Jones and co-workers, and by N. Bjerrum. 

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