Eyepiece micrometer | Science Museum Group Collection

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

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Micrometers for large mural Circle

Micrometers for large mural Circle

Accessories for transit circle by Edward Troughton

Scaleometer micrometer reading direct to .001"

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

Micrometers for large mural Circle

Wollaston type single lens micrometer

Micrometers for large mural Circle

Set of six reading micrometers for large mural Circle

Transit circle by Edward Troughton, London

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

Micrometers for large mural Circle

Micrometers for large mural Circle