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Hand spectroscope

R & J Beck, London
Black lacquered brass diffraction grating hand spectroscope. Length50 mm till 56 mm when pulled out and just under 10 mm in diameter. It fits in its leather covered tube.
Signed: “R & J. BECK. LTD | S.M.H. | PHYSIOL.DEPT. “ first half 20th century.

Collection: private collection