4) ISB (top) & unknown person at 200" coudé spectrograph (1 + 1 negative)

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  4) 200" coudé spectrograph (4)

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  3) 200" coudé spectrograph (1)

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  "Memorandum on Coudé Spectrograph for 200-Inch Telescope."

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  2) ISB looking up at 200" mirror cell (1 + 1 negative)

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  5) Negative of ISB examining plates, c. (1)

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  Image Tube Spectrograph [#1]

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