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Transit circle by Edward Troughton, London, with a micrometer eyepiece and accessories

Transit circle by Edward Troughton, London, with a micrometer eyepiece and accessories

1806

Accessories for transit circle by Edward Troughton

Accessories for transit circle by Edward Troughton

1806

One of three photographs mounted in a glazed frame showing instruments at the Royal Observatory Greenwich around 1914. Airy Transit Circle, made by Troughton & Simms and Ransome & May in 1850, of 8.1-inch aperture and 11-feet, 7-inch focal length viewed from the south towards the eyepiece.

[instruments at the Royal Observatory Greenwich]

1914

Photograph of a meridian circle by Repsold at Pulkovo Observatory, St Petersburg, Russia,. 1876.

Photograph of a meridian circle by Repsold at Pulkovo Observatory

1876

Cooke Reversible Transit Circle, manufactured by Cooke, Troughton & Simms Ltd, York c.1928 for the Royal Observatory, Greenwich. Used to measure positions of stars and planets at Greenwich (1933-post WWII), Herstmonceux (post WWII-1982) and Brorfelde Observatory, Denmark.

Cooke Reversible Transit Circle

1925-1933

Brass transit circle by Dollond, engraved "Dollond London" with 1 extra magnetic needle 9 11/16" long, with two keepers, in box two eyepieces and a diagonal eyepiece, sliding dark glass; sliding

Brass transit circle by Dollond

1800-1825

Selection of three photographs mounted in a glazed frame showing a view of the Airy Transit circle and two aspects of Christie's Altazimuth Telescope, both at the Royal Observatory Greenwich.

3 photographs of the Airy Transit circle and Christie's Altazimuth Telescope

1914

Case for brass transit circle by Dollond, London

Case for brass transit circle by Dollond

1800-1825

Groombridge transit circle, consisting of a telescope revolving in the plane of the meridian, two 4-foot declination circles and twelve micrometer microscopes to read off the exact angle at which the telescope is pointing, with accessories and masonry pillar stand, made by Edward Troughton, London, United Kingdom, 1806. Used by Stephen Groombridge to produce the ‘Catalogue of Circumpolar Stars’ in his observatory in Blackheath, London, United Kingdom, 1806-1823, afterwards purchased by Sir James South for his observatory in Campden Hill, Kensington, London, 1823-1870. Originally, the transit circle was fitted with only four micrometer microscopes, but eight additional ones were added by Sir James South.

Transit circle by Edward Troughton, London

1806

Groombridge transit circle, consisting of a telescope revolving in the plane of the meridian, two 4-foot declination circles and twelve micrometer microscopes to read off the exact angle at which the telescope is pointing, with accessories and masonry pillar stand, made by Edward Troughton, London, United Kingdom, 1806. Used by Stephen Groombridge to produce the ‘Catalogue of Circumpolar Stars’ in his observatory in Blackheath, London, United Kingdom, 1806-1823, afterwards purchased by Sir James South for his observatory in Campden Hill, Kensington, London, 1823-1870. Originally, the transit circle was fitted with only four micrometer microscopes, but eight additional ones were added by Sir James South.

Part of transit circle by Edward Troughton

1806

Groombridge transit circle, consisting of a telescope revolving in the plane of the meridian, two 4-foot declination circles and twelve micrometer microscopes to read off the exact angle at which the telescope is pointing, with accessories and masonry pillar stand, made by Edward Troughton, London, United Kingdom, 1806. Used by Stephen Groombridge to produce the ‘Catalogue of Circumpolar Stars’ in his observatory in Blackheath, London, United Kingdom, 1806-1823, afterwards purchased by Sir James South for his observatory in Campden Hill, Kensington, London, 1823-1870. Originally, the transit circle was fitted with only four micrometer microscopes, but eight additional ones were added by Sir James South.

Part of transit circle by Edward Troughton, London, with a micrometer eyepiece and accessories

1806

One of nineteen photographs taken at the Royal Observatory, Cape of Good Hope, South Africa, showing the Cooke (?) transit circle being reversed on its trolly.

One of nineteen photographs taken at the Royal Observatory

1909

Brass transit circle by Dollond, engraved "Dollond London" with 1 extra magnetic needle 9 11/16" long, with two keepers, two eyepieces and a diagonal eyepiece, sliding dark glass; sliding

Brass transit circle by Dollond

1800-1825

Groombridge transit circle, consisting of a telescope revolving in the plane of the meridian, two 4-foot declination circles and twelve micrometer microscopes to read off the exact angle at which the telescope is pointing, with accessories and masonry pillar stand, made by Edward Troughton, London, United Kingdom, 1806. Used by Stephen Groombridge to produce the ‘Catalogue of Circumpolar Stars’ in his observatory in Blackheath, London, United Kingdom, 1806-1823, afterwards purchased by Sir James South for his observatory in Campden Hill, Kensington, London, 1823-1870. Originally, the transit circle was fitted with only four micrometer microscopes, but eight additional ones were added by Sir James South.

Part of transit circle by Edward Troughton

1806

One of two photographs showing a transit circle by Pistor and Martin at the U.S. Naval Observatory, Washington.

One of two photographs showing a transit circle by Pistor and Martin at the U.S. Naval Observatory

1876

One of nineteen photographs taken at the Royal Observatory, Cape of Good Hope, South Africa, showing the building with a shutter roof for the reversible transit circle by Cooke?

One of nineteen photographs taken at the Royal Observatory

1909

One of nineteen photographs taken at the Royal Observatory, Cape of Good Hope, South Africa, showing the reversible transit circle by Cooke

Photograph of reversible transit circle

1909