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Sir William Ramsay's direct-vision spectroscope, 1880-1890.
Enlarged view of a spectroscope, 1874.
Engraving of a spectroscope attached to a telescope for solar work, 1874.
Altitude instrument.
Spectroscope with comparison scale, c 1860-1870.
Spectroscope with comparison scale, c 1860-1870.
Hilger wavelength spectrometer with camera, c 1919.
Thomas Cooke & Sons siderostat, 1876.
Spectroscope with seven prism train, 1868.
Spectroscope with seven prism train, 1868.
'The Physical Laboratory of the Academie des Sciences', Paris, c 1700.
Foncault siderostat, Paris Observatory, France, 1876.
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