Photograph: film positive
- Made:
- 1919 in Mount Wilson
Photograph: film positive, 7 1/2" x 3 1/2", stereoscopic picture of Copernicus, taken with the 100-inch Hooker Telescope of the Mount Wilson Observatory 134-foot Cassegrain focus, 1919 August 5, 1919 September 15, size of image 5 3/8" x 3" Bromide print of same
