(under subclass 128) Subject matter wherein there is a prism and a solid or fluid medium to be examined for refractive
index and forming an interface surface with the prism, this prism being part of the detecting and indicating means, whereby the modification of the light transmitted across or reflected at the interface surface due to the refraction of the medium is shown in the detecting and indicating device.
(1) Note. Included herein are immersion type refractometers.
SEE OR SEARCH CLASS
203, Distillation: Processes, Separatory,
3, for processes of distilling fluids which may include a refraction test of the fluid.
359, Optics: Systems (Including Communication) and Elements, 831+, for prisms, per se.
