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Cambridge Observatory eight-foot mural circle

1832
One of two photographs showing a transit instrument by Ertel and a mural circle made by Troughton and Simms at the U.S. Naval Observatory, Washington.

One of two photographs showing a transit instrument by Ertel and a mural circle made by Troughton and Simms

1876
Photograph of a mural circle transit instrument by, Gambey at the Paris Observatory, diameter objective O.12 metres.

Photograph of a mural circle transit instrument by

1884