Photograph of Cambridge Observatory Transit Circle, presumably in Thomas Cooke and Son workshop, York, 1870
<p>Original image: anonymous.
</p>
Scan: University of Cambridge, Institute of Astronomy Library
<p>Apollo - University of Cambridge repository: <a rel="nofollow" class="external free" href="https://www.repository.cam.ac.uk/handle/1810/214776">https://www.repository.cam.ac.uk/handle/1810/214776</a>
There, the file is listed as belonging to the collection "Images from the Institute of Astronomy Library"
</p>
That collection description states "The original images in this collection are out of copyright. However, we ask you to acknowledge the preservation and scanning of the original by making acknowledgement to "University of Cambridge, Institute of Astronomy Library" with any public use of the scanned images. Please contact ioalib[AT]ast.cam.ac.uk for any enquiries." as per <a rel="nofollow" class="external free" href="https://www.repository.cam.ac.uk/handle/1810/214761">https://www.repository.cam.ac.uk/handle/1810/214761</a> .