Simple one-prism, three-arm brass spectroscope on an iron tri-leg base. The "HEELE-BERLIN" inscription on the prism cover is that of Hans Heele, a German firm that made a wide range of precision optical and mechanical instruments. Heele was in business by 1893, and aquired by Bamberg in 1923. The "IMPORTED BY ARTHUR H. THOMAS CO. PHILADELPHIA" tag on one leg refers to an instrument supply firm that was established in 1900.
Ref: Hans Heele, Spectroscopes and Spectroscopic Accessories (Berlin, 1907), pp. 14-15.
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