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Three prism solar spectroscope with automatic prism adjustment and a fixed equatorial mounting with drive by Grubb

Three prism solar spectroscope with automatic prism adjustment and a fixed equatorial mounting with drive by Grubb

1871
Solar spectroscope with stand by T. Cooke and Sons

Solar spectroscope with stand by T. Cooke and Sons

1881
Spectroscope from Norman Lockyer Observatory for solar work by John Browning with diffraction reflection grating ruled on speculum metal by D.C. Chapman with engine of Lewis Morris Rutherfurd, 24 April 1878, 17296 lines per inch.

Spectroscope from Norman Lockyer Observatory for solar work

1878
Three-prism solar spectroscope with automatic prism adjustment for minimum deviation and a fixed equatorial mounting with drive by Howard Grubb, Dublin, dated 1871. Supplied by the Royal Society of London to J.B.N.Hennessey who used the instrument at Vincent Hill, Dehra Dun in the Indian foothills [7,000 ft.] of the Himalayas to map the solar spectrum between 1871-5.

Solar spectroscope by Howard Grubb, Dublin, 1871

1871
Evershed Solar Spectroscope for viewing prominences by Adam Hilger Ltd., London (RAS No.526, Allen No.20). Presented to the Royal Astronomical Society in 1945 by Miss G.R.Allen.

Evershed Solar Spectroscope for viewing prominences by Adam Hilger Ltd

1910-1920
Three prism spectroscope with equatorial mounting engraved 'Royal Society - 1867', made by Troughton and Simms, London.

Three prism spectroscope with equatorial mounting, engraved 'Royal Society - 1867'

1867
Three prism solar spectroscope with equatorial mounting engraved 'Royal Society - 1867', made by Troughton and Simms, London, in two cases

Three prism solar spectroscope with equatorial mounting and cases

1867
Two large 60 º glass prisms made by Adam Hilger Limited for the three prism Oxford Solar Spectroscope. These were replacements for the original prisms supplied in 1938 but apparently were never used as the instrument was replaced by a spectrograph using a grating.

Two large 60 º glass prisms

1940-1950
Solar spectroscope with stand and two mahogany boxes by T. Cooke and Sons, York, England, 1881. Used at the Solar Physics Observatory, South Kensington between 1881 and 1912. The set of prisms give a high dispersion equal to 20 prisms, by passing the light through the prisms train four times.

Solar spectroscope by T. Cooke & Sons, 1881

1881
Selection of components from the three prism Oxford Solar Spectroscope made by Casella Limited with optical components from Adam Hilger Ltd. for the University Observatory, Oxford in 1938. Parts include two large 60 º prisms, one prism stand and the collimator objective lens.

Selection of components from the three prism Oxford Solar Spectroscope made by Casella Limited

1938