| 摘要 |
This specification discloses a refractometer of the type in which a sample is introduced onto a prism by a pump device, whereafter the sample is illuminated so that the critical angle of the total reflection determined by the refractive indices of the sample and the prism is measured. The refractometer comprises a substantially rectangular parallelopiped frame member, a cylinder provided within the frame member and having a piston slidably disposed at the upper end thereof, an observation lens barrel disposed laterally within the frame member and in juxtaposed relationship with the cylinder, prism holding means, and reflector means for directing a light beam emergent from the prism to the observation lens barrel.
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