A nineteenth century German spectroscope in brass and iron from Heele; image credit on full record.
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Spectroscope; Heele (Berlin), Triangular Prism, Iron Tripod Base, 9 inch.
A brass and iron spectroscope, Heele, Berlin, 19th century with tripod base supporting a barrel with eyepiece, a barrel with adjustable slit opening, ... [more detail available via subscription]
