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Description
Schematic cutaway drawing of spectrohelioscope, driving mechanism or oscillating slits. Ink on card stock, with penciled notes, 10 x 7.75 inches, unsigned and 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 Figure 3, p. 282. Porter Papers. No Date
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