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Optical instrument for measurement of astronomical photograph plates

Optical instrument, for measurement of astronomical photograph plates, metal / glass / wood, used at Sydney Observatory, designed by H H Turner, made by Troughton and Simms, London, England, 1892-1915 An optical machine for measuring astronomical photographic plates with a wooden storage box and a cylindrical weight. There are three metal attachments with the machine and a white glass plate. The machine allows astronomical photographic plates to be measured in two co-ordinates at right angles to each other. Measurements are made using reseau lines marked on a glass graticule. Observatory stock number 292, 1920.

View object on the British Library on Flickr Commons site (opens in new window).

(Accession num: H10140)

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