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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