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Circular Glass Mirror, Silver and Platinised, by Leon Foucault, 1857-1868

Circular Glass Mirror, Silver and Platinised, by Leon Foucault, 1857-1868

1857-1868
Primary metal speculum mirror with central hole

Primary metal speculum mirror with central hole

1840-1850
White enamel glass mirror and box, by William Herschel

White enamel glass mirror and box, by William Herschel

1780-1800
Circular glass mirror (80 mm)

Circular glass mirror (80 mm)

1960-1970
Glass disc for telescope mirror

Glass disc for telescope mirror

1840-1870
Glass wedge mirror aluminised on the hypotenuse surface

Glass wedge mirror aluminised on the hypotenuse surface

1960-1970
Circular quartz planar mirror (5-inch)

Circular quartz planar mirror (5-inch)

1960-1970
Silvered and platinized glass (Foucault)

Silvered and platinized glass (Foucault)

1857-1868
Optical parts of Lassell's telescope

Optical parts of Lassell's telescope

1840-1850
Mirror for Short's reflecting telescope

Mirror for Short's reflecting telescope

1760-1762
Circular planar mirror, 15-mm diameter

Circular planar mirror, 15-mm diameter

1960-1970
Circular mirror, 80-mm diameter

Circular mirror, 80-mm diameter

1960-1970
Circular mirror, 3.4-inch diameter

Circular mirror, 3.4-inch diameter

1960-1970
Circular mirror, 10-inch diameter

Circular mirror, 10-inch diameter

1960-1970
25-mm diameter, low expansion glass mirror

25-mm diameter, low expansion glass mirror

1960-1970
Planar mirror, 25-mm diameter

Planar mirror, 25-mm diameter

1960-1970
25-mm diameter, low expansion glass mirror

25-mm diameter, low expansion glass mirror

1960-1970
25-mm diameter, low expansion glass mirror

25-mm diameter, low expansion glass mirror

1960-1970
Mirror for Short's reflecting telescope

Mirror for Short's reflecting telescope

1767-1768
Speculum mirror for Gregorian telescope

Speculum mirror for Gregorian telescope

1753-1755
speculum mirror, 1783-1785

speculum mirror, 1783-1785

1783-1785
Circular mirror, 40-mm diameter

Circular mirror, 40-mm diameter

1960-1970
Circular mirror, 40-mm diameter

Circular mirror, 40-mm diameter

1960-1970
Circular mirror, 4-inch diameter

Circular mirror, 4-inch diameter

1960-1970
Circular mirror, 8-inch diameter

Circular mirror, 8-inch diameter

1960-1970
15-mm diameter, low expansion glass mirror

15-mm diameter, low expansion glass mirror

1960-1970
25-mm diameter, low expansion glass mirror

25-mm diameter, low expansion glass mirror

1960-1970
30-mm diameter, low expansion glass mirror

30-mm diameter, low expansion glass mirror

1960-1970
Speculum mirror of 2 1/2-inch aperture

Speculum mirror of 2 1/2-inch aperture

1756-1758
Silver-on-Glass Telescope Mirror

Silver-on-Glass Telescope Mirror

1865-1890
Circular glass mirror (4 1/2-inch)

Circular glass mirror (4 1/2-inch)

1934
Silvered glass telescope mirror of diameter 9 1/2 in

Silvered glass telescope mirror of diameter 9 1/2 in

1880-1900
Circular glass mirror (10 1/2-inch)

Circular glass mirror (10 1/2-inch)

1950
Primary speculum mirror of 13 1/4-inch diameter

Primary speculum mirror of 13 1/4-inch diameter

1840-1850
Speculum Mirror (dia. 5 3/4-inch) for Gregorian telescope in wooden box

Speculum Mirror (dia. 5 3/4-inch) for Gregorian telescope in wooden box

1750-1850
Circular glass mirror (5 1/2-inch)

Circular glass mirror (5 1/2-inch)

1930-1939
The first 48-inch speculum mirror cast 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
Speculum mirror of 6 1/4-inch diameter in brass cell with tinplate cover for 7-foot telescope owned by Caroline Herschel, late 18th century.

Newtonian reflecting telescope, 1795-1816

1795-1825
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
Four primary metal speculum metal mirrors, three of 4 1/2- inch diameter and one of 8 5/8 inch mirror with central circular hole. Donated by Lieutent General A, de Gorloff who lived at Nasmyth's former home of Hammerfield near Penshurst in Kent. Four similar mirrors were originally donated but one was returned to be replaced by the larger one [see file for details].

Four primary metal speculum metal mirrors

1840-1850
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"

Mirror of speculum metal in tin cell

1780-1820
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 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
Silvered and platinized glass (Foucault) in small wooden box

Silvered and platinized glass (Foucault) in small wooden box

1857-1868
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
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
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
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 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