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Description
Perspective drawing of combined spectrograph, spectroheliograph and spectrohelioscope. Pencil and ink on board, 11.5 x 8.75 inches, unsigned, undated. George E. Hale, "The Spectrohelioscope and its Work, Part I: History, Instruments, Adjustments, and Methods of Observation, The Astrophysical Journal 70 (December 1929): 265-311. Published as Plate XX. Porter Papers. No Date
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