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Stellar Spectra Dispersion ~90A/mm-11 glass slide: circa 1879

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Stellar Spectra Dispersion ~90A/mm-11 glass slide: circa 1879

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Stellar Spectra Dispersion ~90A/mm-11 glass slide: circa 1879

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Focus photography: 11 March 1882

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Photographic experiment no. 1: 28 May 1882

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Photographic experiment no. 2: 28 May 1882

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Sun 10^5 Oxygen: 11 June 1882

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Sun 10S: 11 June 1882

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Carbon: 10 July 1882

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Spectra (14): 19 January ----?

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Spectra (14): 14 January ----?

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Brass (27): 25 February ----?

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Spectra (7): 31 May 18--?

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Spectra (6): 12 June 18--?

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Spectra (6): undated

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Spectra (7): undated

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Spectra (17): undated

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Spectra (18): undated

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Spectra (12): undated

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Spectra (3): undated

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Spectra (5): undated

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Spectra (1): undated

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Spectra (2): undated

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Spectra (3): undated

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