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  1. One of the laboratories of the Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S. Department of Agriculture.
  2. Means for controlling humidity will be described elsewhere.
  3. Modern instrument of this type is described in the catalog of Bausch and Lomb Optical Company.
  4. Such an instrument is described in the catalog of the Fisher Scientific Company, Pittsburgh, Pennsylvania.
  5. Zamin interferometer.

Other (5)

One of the laboratories of the Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S. Department of Agriculture.

Means for controlling humidity will be described elsewhere.

Modern instrument of this type is described in the catalog of Bausch and Lomb Optical Company.

Such an instrument is described in the catalog of the Fisher Scientific Company, Pittsburgh, Pennsylvania.

Zamin interferometer.

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Figures (6)

Fig. 1
Fig. 1

A simple photoelectric refractometer, R, bent round glass rod immersed in the test liquid; P, photoelectric cell; G, galvanometer; L, light source.

Fig. 2
Fig. 2

A differential photoelectric refractometer. Two photoelectric cells are in opposition.

Fig. 3
Fig. 3

Forms of prisms for the photoelectric refractometer.

Fig. 4
Fig. 4

A precision photoelectric refractometer.

Fig. 5
Fig. 5

Relationship between refractive index and galvanometer deflection for a series of aqueous saline solutions. Full galvanometer sensitivity utilized (10−4 μA/mm).

Fig. 6
Fig. 6

Relationship between refractive index and galvanometer deflection for carbon tetrachloride, propyl alcohol, acetone, and water, when the incandescent tungsten lamp is placed in two positions, curves 1 and 3; and when the light source is sodium arc, curve 2. Galvanometer sensitivity utilized—0.02 μA/mm.

Tables (1)

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Table I