Introduction and Historical Statement.
Reading edition
The atomic weight of cadmium has been investigated by a number of chemists but the results obtained vary between wide limits. The work described in this paper was undertaken with the object of finding the cause of the discrepancy in some of the methods employed. A complete historical statement has been given by Morse and Jones, (Amer. Chem. Jour., 14. 261.) and it is only necessary, here, to give a summary for the purpose of reference:
Ratio. At. Wt. Cd.
1818, Stromeyer, Cd : CdO 111.483
(Schweiggers Jour. 22, 336.)
1857, Von Hauer, CdSO4 : CdS 111.935
2 (Jour. f. Prakt. Chemie 72, 338.)
1859, Dumas, 1st series. CdCl2 : Ag 112.416
2d „ CdCl2 : Ag 112.007
(Ann. Chim. Phys. [3], 55, 158.)
1860, Lenssen, CdC2O4 : CdO 112.043
(Jour. f. Prakt. Chem. 79, 281)
1882, Huntington and Cooke, CdBr2 : AgBr 112.239
„ „ CdBr2 : Ag 112.245
(Proceedings Amer. Acad. 17, 28)
1890, Partridge, 1st Series CdC2O4 : CdO 111.816
„ 2d „ CdSO4 : CdS 111.727
„ 3d „ CdC2O4 : CdS 111.616
(Amer. Jour. Sci.[3], 40, 377)
1892, Morse and Jones, 1st Method, Cd : CdO 112.0766
2d „ CdC2O4 : CdO 112.632
1892, Torimer and Smithy CdO : Cd 112.055
(Zeit. f. Anorg. Chem. I. 364)
In this summary as well as in the rest of this paper the following 3atomic weights are used:
Oxygen = 16.00
Sulphur = 32.059
Carbon = 12.003
Chlorine = 35.45
Bromine = 79.95
Silver = 107.93