Gold-plated grazing - incidence paraboloidal mirror for X-ray astronomy Gold-plated grazing - incidence paraboloidal mirror for X-ray astronomy 1975-1980
Specimens showing results of a process, for polishing marbles etc, invented by A. Gath of Rome about the year 1825, and applied to reflectors for astronomical purposes: a) Reflector of Nero Antico b) Piece of sililian jasper agate c) Piece of green granite Erbetta d) Similar piece polished according to the old process by Frattoddi e) Disc of eleven agates as used for polishing a small reflector Specimens showing results of a process 1825
Circular glass mirror (6-inch), aluminium coated with marked focal ratio of f1. Circular glass mirror (6-inch) 1960-1970
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the mirror support cell for the telescope arriving at the Observatory on a lorry. Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope 1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the mirror being polished and given its final figure in the optical workshop. Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope 1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the un-silvered mirror raised into the vertical for testing in the optical workshop. Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope 1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the mirror cell with its upper section removed revealing the support mechanism and the water pipes for temperature regulation. Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope 1916-1918
Six and a half inch glass mirror in original brass cell, with close fitting tin cap with handle cell 1 1/16" deep outside, exact focal length 7ft 1.75 in, "D" painted on cell and lid Six and a half inch glass mirror in original brass cell 1780-1820
Collection of 15 aluminium coated glass or quartz mirrors from the spectrograph used at the coude focus of the 35-Metre Solar Telescope built in 1955 at the University Observatory, Oxford, unsigned, 1960-1970. Collection of 15 aluminium coated glass or quartz mirrors 1960-1970
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the mirror at the early grinding stage in the optical workshop. Grinding & polishing machine for the Hooker Telescope mirror, 1910-16 1916-1918
The first 48-inch speculum mirror cast with metal cover by Sir William Herschel in 1785 for his 'Forty Foot' telescope at Slough, England. Original mirror for William Herschel's forty-foot telescope, 1785. 1785
Experimental speculum of 6 inches aperture and 24 inches focal distance, cracked across and bound together with string Experimental speculum of 6 inches aperture and 24 inches focal distance 1840-1870
Silver-on-glass mirror of 9-inch aperture by G.H.With, plus driving clock from Canon Cross's equatorial Newtonian telescope (RAS No.141). Presented to the Royal Astronomical Society in 1900 by Mrs Cross. Silver-on-glass mirror of 9-inch aperture by G.H.With 1865-1890
Experimental compound speculum mirror of 2 feet diameter, made by the 3rd Earl of Rosse. The 9 segments of speculum metal, are held in an alloy of copper and zinc. Experimental compound speculum mirror of 2 feet diameter 1840-1845
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the completed mirror in it support cell ready to be lift into position on the telescope. Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope 1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the completed mirror being lift into position onto the support mechanism of the mirror cell. Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope 1916-1918
Nine inch mirror of speculum metal (exact diam" 8 15/16 in) in tin cell with close fitting cover 9 1/2" diam, 1 1/2" deep, focal length 10' 1", cell and cover each painted " J" Nine inch mirror of speculum metal (exact diam" 8 15/16 in) in tin cell with close fitting cover 9 1/2" diam 1780-1820
Optical parts of Lassell's telescope:- prism for 9-in reflector in green cardboard box; 3 multiple eyepieces; 5 small eyepieces; speculum for Newtonian finder in tin case 4 eyepices; 4 diaphragms (3 in two tin cases and one in wood case with metal lid) Optical parts of Lassell's telescope 1840-1850