Glass positive:- Mars and San Jose, (photographs in light of different colours) W.H. Wright, Lick Observatory, 1924, November 9, 36-inch Reflector, focal length, 210 in, a, c violet; b, d infra-red 8 1/2" x 8 1/2" Glass positive:- Mars and San Jose 1924
Photographic transparencies (glass positive) of Mars, (photographs in light of different colours). Taken by W.H. Wright, Lick Observatory, 1926, October 16, with a 36-inch reflector, focal length, 210in. Photographs in ultra-violet, green, yellow red, infra-red, and violet light respectively. Glass positive of Mars 1926-10-16
Photographic transparency (glass positive) of Mars, cloud pictures, (photographs in violet or ultra-violet light). Taken by W. H. Wright, Lick Observatory, 1926, October 14, 15, 16, 18, with a 36-inch reflector, focal length, 210in, 6 1/2" x 4 1/4". Glass positive of Mars 1926-10
Photographic transparency, glass positive, of Mars, (photographs in light of different colours). Taken by W.H. Wright, Lick Observatory, 1926 November 2, 3, with a 36-inch reflector, focal length, 210 in. Right and left photographs in infra-red light. Glass positive of Mars 1926-11-02