This is a photo relating to Mount Wilson Observatory, California made from an original 5x7 inch glass plate negative between 1912 and 1919. If you have more information about this or any of the others I have, please go to this page and send me a note.
Thanks, Mike Ryan


Polishing equipment and some prisms.
"The 'prisms & polishing' shot appears in a typewritten publication: Ritchey, G.W. Report on Technical Details of Optical Work Undertaken by the Mt. Wilson Observatory of the Carnegie Institution for the Army Ordnance Department; July, 1918 - April, 1919. n.d., n.p. 75pp, typewriter carbon copy." (Peter Abrahams note.) . . . and I have the negatives . . .
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