. Radiometric investigation of water of crystallization, light filters and standard absorption bands . eciabletransmission amounting to 13 percent at the maximum. Nickel nitrate was also examined,and a similar (high) transmissionband was found at It there-fore appears that these nickel saltsare not suitable for absorption sulphate, CuS04+^H20.—The transmission curve (...) of asaturated solution of copper sulphateis given incurve d, figure 16. Thereis complete opacity beyond *. The transmission is high in theblue, so that this substance is suit-able for eliminating al
. Radiometric investigation of water of crystallization, light filters and standard absorption bands . eciabletransmission amounting to 13 percent at the maximum. Nickel nitrate was also examined,and a similar (high) transmissionband was found at It there-fore appears that these nickel saltsare not suitable for absorption sulphate, CuS04+^H20.—The transmission curve (...) of asaturated solution of copper sulphateis given incurve d, figure 16. Thereis complete opacity beyond *. The transmission is high in theblue, so that this substance is suit-able for eliminating all but the bluelight. Copper potassium chloride, CuCl2-2KCl + 2H20.—The transmis-sion of a per cent solution of copper potassium chlorideis given in curve /, figure 16. Its transmission is not muchgreater than cupric chloride in the visible while at it trans-mits per cent against per cent for the same concentrationof cupric chloride. See figure 17. Copper acetate, Cu(C2H302)2.—The transmission of a 5 per cent(2 g in 38 cc H20, 3 drops acetic acid) solution of copper acetate. M Fig. 16.—Copper; Acetate (a, b, c),Sulphate (d), and Potassium Chlo-ride (/) 33 E. F. Nichols: Phys. Rev., 1, p. i: 50; 1908. See also Carnegie Publication No. 97. Cobientz] Water of Crystallization 659 is given in curve a, figure 16. Curve b gives the transmission ofa per cent solution and curve c gives the transmission of a 1per cent solution of copper acetate. The latter transmits toomuch infra-red radiation (about 7 per cent at to be of greatuse as an absorption screen. Cupric chloride, CuCl2 + 2H20.—The most suitable screen forabsorbing the infra-red, and at the same time having a high trans-mission in the yellowish green and in the blue is cupric is illustrated in the various curves given in figure 17. Curve1 gives the transmission of a 10 per cent solution (2 gr. CuCl2 +18 cc H20 + 2 drops of 20 per cent HC1) of cupric chloride. Curv
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