Optical instrument, for measurement of astronomical photographs, metal / glass / wood, used at Sydney Observatory, designed by H H Turner, made by Troughton and Simms, London, England, 1892 - 1915. A plate measuring machine with a wooden storage box and two cylindrical weights. 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 291.
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(Accession num: H10139)
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