Description of the altitude and azimuth instrument, erected at The Royal Observatory, Greenwich, in the year 1847.

Licence: Public Domain Mark

Credit: Description of the altitude and azimuth instrument, erected at The Royal Observatory, Greenwich, in the year 1847. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.