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1. Incident prism
7. Eyepiece
2. Refracting prism
8. Paralleling prism
3. Swingable mirror
9. Reading objective
4. Dispersion compensation prism group
10. Reflecting mirror
5. Telescopic objective
11. Scale plate
6. Screen
12. Condenser
Between the incident prism (1) and the refracting prism (2) there exists a minute and homo
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geneous space in which the tested liquid is placed.
When a light beam (daylight or incandescent) enters the incident prism (1) and passes throu
-
gh the refracting prism (2), a light beam of which the refracting angles are greater than the
critical angle is produced. The beam will enter via the swingable mirror (3) and travel through
the dispersion free prism group (4).
5.0 FUNCTION AND CONSTRUCTION OF THE REFRACTOMETER
Fig.3
