The 6-inch transit circle by Troughton & Simms, London, installed at Sydney Observatory in 1877. This phototgraph was probably taken in the 1880s.

Photograph in a photograph album used at Melbourne Observatory, late 19th century. The photographs show the main Melbourne Observatory building, Great Melbourne Telescope, 8-inch transit telescope, recording equipment, observatories in other cities and countries, astronomers, astronomical photographs of sun and stars.

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Transit instrument, Sydney Observatory.

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