REFRACTIVE INDEX OF A LIQUID BY CRITICAL ANGLE METHOD VINTAGE {PHYSICS} BY GRIFFIN BAKELITE & MAHOGANY

The apparatus consists of a wooden stool supporting a rotatable brass frame in which is mounted a glass air cell, (not included). The frame is attached to a large milled head which rotates above a 0-360 degree scale  

Overall length: 6 inches

Condition: excellent,

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