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 Photograph: film positive 1919
Set of mounted stereoscopic views by Underwood & Underwood, in bookform case. Set of mounted stereoscopic views by Underwood & Underwood
