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Oxford Heliometer, with observer's desk, chair and stool

Oxford Heliometer, with observer's desk, chair and stool

1840-1848
Divided object-glass micrometer by George Dollond

Divided object-glass micrometer by George Dollond

1821-1857
Cassegrain reflecting Telescope of 2 1/2-inch aperture

Cassegrain reflecting Telescope of 2 1/2-inch aperture

1756-1758
Divided object-lens micrometer by Peter Dollond for cassegrain reflecting Telescope of 2 1/2-inch aperture

Divided object-lens micrometer by Peter Dollond for cassegrain reflecting Telescope of 2 1/2-inch aperture

1754-1757
Double image object glass micrometer by Dollond, engraved Dollond, London.

Double image object glass micrometer by Dollond

1754-1770
Double-image object glass micrometer by Dollond, engraved Dollond, London with mahogany case.

Double-image object glass micrometer by Dollond

1754-1770
One of nineteen photographs taken at the Royal Observatory, Cape of Good Hope, South Africa, showing the dome and building for the 7-inch Heliometer by Messrs Repsold and Sons, Hamburg. Used widely by Sir David Gill to make stellar parallax measurements from 1887 onwards.

One of nineteen photographs taken at the Royal Observatory

1909
Heliometer built by A. & G. Repsold of Hamburg with a 7 1/2 inch object lens by Merz of Munich. Ordered in 1840 and delivered to the Radcliffe Observatory, Oxford, in 1848 where it was used for stellar parallax observations.

Heliometer with 7 1/2 inch object lens, built for Radcliffe Observatory

1840-1848
Bottom magnifying lens, eyepiece end, from heliometer built by A. & G. Repsold of Hamburg with a 7 1/2 inch object lens by Merz of Munich. Ordered in 1840 and delivered to the Radcliffe Observatory, Oxford, in 1848 where it was used for stellar parallax observations. Includes observer's desk, chair and stool.

Oxford Heliometer, with observer's desk, chair and stool

1840-1848
Divided object-glass micrometer by Dollond, London, part of refracting telescope (1987-722) by Simms (RAS No.30, Sheepshanks No.4).

Divided object-glass micrometer by Dollond

1821-1857