. Carnegie Institution of Washington publication. SOLUTIONS. 103 The reflection band of the solid crystal does not agree with the one found by Pfund at /*, which is the mean value of the present curve. In the present curve the maximum is evidently complex. Neither does the maximum of the solid and that of the solution agree, which is prob- ably to be expected. In fact, the study of solutions was undertaken to test this very point. COPPER SULPHATE (CuSO4+sH*O). In fig. 87, curve a is for a saturated solution of copper sulphate in which the maximum of reflection is very sharp at p. For
. Carnegie Institution of Washington publication. SOLUTIONS. 103 The reflection band of the solid crystal does not agree with the one found by Pfund at /*, which is the mean value of the present curve. In the present curve the maximum is evidently complex. Neither does the maximum of the solid and that of the solution agree, which is prob- ably to be expected. In fact, the study of solutions was undertaken to test this very point. COPPER SULPHATE (CuSO4+sH*O). In fig. 87, curve a is for a saturated solution of copper sulphate in which the maximum of reflection is very sharp at p. For a solid crystal of this material the maximum (curve c) coincides with that of the solution. The reflection band found by Porter at /* really occurs at /*. The former value is due to an error in computation. ZINC SULPHATE (ZnSO*+7H2O). The reflecting power is somewhat higher than in the preceding com- pound. The maximum (curve b, fig. 87) occurs at /* for a saturated solution of this compound. SODIUM SULPHATE (NaSCX+ioHiO). The selective reflection of a satu- rated solution of this compound is shown in curve a, fig. 88. The maxi- mum occurs at p, while Pfund found it at /*, using the surface of PJG a mass of crystals. MERCURY (Hg).. to HjU -Sodium sulphate (a); Potassium sulphate. Several observations were made on the reflecting power of mercury, but the present arrangement was not well adapted to determine the absolute reflecting power, and no thorough examination was made. The chief difficulty is in having the two surfaces at the same level. Values of reflecting power as high as 85 per cent (purity not known) were observed, while the computed value is 90 per cent at 12 p. Earth tremors had but little effect on the surface; while, if pure dust- free mercury be used, this is the best substance available to compare the effect of the polish upon the reflecting power in the region of short wave-lengths. In fact, the determination of the absolute reflecting pow
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