This wooden camera, designed for use with a wavelength spectrometer, has brass fittings, an ivory scale, and cardboard bellows. The inscription reads “ADAM HILGER LTD. / LONDON, ENGLAND / No. D10.302 / 33435.” Three paper tags read “PHYSICS DEPT / COLUMBIA UNIV / 6336.”
Ref: Adam Hilger, Ltd., Spectrographs (London, 1912), pp. D3-D4.
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