Milk fat content-measuring apparatus

Claim 1

A milk fat content-measuring apparatus which comprises a source of light; an optical guide having at least first and second light passageways for guiding light delivered from the source of light; a cuvette provided in the first light passageway of the optical guide so as to conduct the fat of a milk sample being examined; an optical correction device received in the first light passageway adjacent to the cuvette, formed of an open window and at least one optical correction window including at least one transparent glass plate over which there are uniformly formed a number of scratches each having such a dimension as is capable of giving an optical result corresponding to milk fat particles, and so constituted as to cause these windows to be selectively aligned with the first light passageway; a first photoelectric conversion device disposed at the outlet of the first light passageway so as to convert the source light guided by said passageway through the cuvette and optical correction device into an electric signal; a second photoelectric conversion device provided at the outlet of the second light passageway so as to convert the source light traveling through said passageway directly into an electric signal; an electric signal mixer supplied with output signals from the first and second photoelectric conversion devices; and an indication type gauge for indicating a value based on an output from the mixer, whereby the measuring apparatus can have its operation corrected accurately to show a prescribed milk fat content on said gauge.