A 21-Foot Multiple Range Grazing Incidence Spectrograph

Abstract
A 21‐foot grazing incidence spectrograph, with wave‐length ranges 0–470A and 0–2100A, is described. The use of a single photographic plate 154 cm long, coated on commercial polished plate glass, and a cylindrically ground cast plate holder, makes the dispersion curve smooth and close to the calculated one. Descriptions are given of the mechanical structure; the optical system and the method of focusing; and the electrical system, including a 3‐μf, 70‐kv condenser.

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