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Granite Spectroscope (12): 21 May 1880

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Grating (2) - No. 3: 23 May 1880

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Brating Carbon Crucible (1): 24 May 1880

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Grating Spectroscope (15): 24 May 1880

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Grating (11): 31 May 1880

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

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Iodine (8): 17 January 1881

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Photographic experiment no. 1: 18 January 1881

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Photographic experiment no. 2: 18 January 1881

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Maxim (9): 21 January 1881

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Photographic experiment ex 60th: 22 January 1881

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Photographic experiment: 23 January 1881

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Photographic experiment: 29 January 1881

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Photographic experiment: 6 February 1881

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Photographic experiment no. 2: 6 February 1881

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Photographic experiment grating: 13 February 1881

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Photographic experiment grating: 13 February 1881

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Sun prisms: 20 February 1881

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Carbon ore prisms: 20 February 1881

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Photographic experiment no. 1: 22 February 1881

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Photographic experiment no. 2: 22 February 1881

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No. 1 90S: 24 February 1881

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No. 2 5m slit 14/5000: 24 February 1881

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Carbon ore 90S: 25 February 1881

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