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Figures (5)

Fig. 1
Fig. 1

General disposition of apparatus: ground glass G bearing diagonal wire W whose image is modified, as shown, by the cylindrical mass of liquid in the test tube A and the glass rod R.

Fig. 2
Fig. 2

Appearance of wire image when test tube is filled with the following liquids: A, acetone (n=1.36), B, carbon bisulphide (n=1.62), C, mixture having nearly the same refractive index as the glass rod (n=1.51).

Fig. 3
Fig. 3

Accuracy of setting improved by adjusting crosshair to tangency to wire image at xx′.

Fig. 4
Fig. 4

Calibration curve.

Fig. 5
Fig. 5

Appearance of wire image when: A—refractive index of glass rod (ng)>that of fluid (nl); B—refractive index of glass rod (ng)<that of fluid (nl).