Andrew Philpott of St Kitts kindly sent this image in, after picking up an intriguing detail. It is a 'zoomed-in' section of a larger image, courtesy of the State Library of South Australia.
Andrew said, "The image is of a section of the Kapunda copper mine from 1879, at the end of the mine's life. This is a time exposure process where the image is etched onto a glass plate with an exposure perio...
