Positive transparency on film, size 6 1/2" x 8 1/2", Mars in blue and red light, 200" Hale Telescope of Palomar Observatory Positive transparency on film 1966
Glass diapositive, 3 1/4"x2", of Mars. Taken by A. Dollfus with the 60cm. Refractor at the Pic-du-Midi Observatory at 0h.40m. on 8th July 1954 Glass diapositive 1954; 1963
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
Enlarged photographs of the planet Mars, E.E. Barnard, Yerkes Observatory, 1909, September 24th, 16h. 55m. G.M.T. 40-inch refractor, exposure, 4 sec, to 5 sec, Yellow colour screen Enlarged photographs of the planet Mars 1909
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