![](https://coimages.sciencemuseumgroup.org.uk/29/406/large_thumbnail_1931_0797__0002_.jpg)
Photograph of a vertical circle by Ertel at the Pulkovo Observatory
- Made:
- 1876 in St Petersburg and Russia
Photograph of a vertical circle by Ertel at the Pulkovo Observatory, St Petersburg in Russia, 1876.
Photograph of a vertical circle by Ertel at the Pulkovo Observatory, St Petersburg in Russia, 1876.