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Large projection polariscope in three mahogany cabinets, by C.D. Ahrens, c. 1877. The polarising nicol prism is 3 1/2-inch clear aperture, the analysing nicol prism is 3 1/4-inch clear aperture, mounted in brass fittings for rotation &c with accessories, on attached sheet.
Large projection polariscope, made by C. D. Ahrens, c. 1877.
Three mahogany cabinets for large projection polariscope, made by C.D. Ahrens, c. 1877.
