TY - JOUR T1 - An Automatic Optical Photograph, Abstract JF - Publications of the Astronomical Society of the Pacific Y1 - 1919 A1 - Douglass, A.E. KW - astronomy KW - Douglass KW - optic KW - optical KW - photograph ER - TY - JOUR T1 - An Optical Photograph JF - The Astrophysical Journal Y1 - 1915 A1 - Douglass, A.E. KW - astronomy KW - Douglass KW - optical KW - optics KW - photograph VL - XLI IS - No. 3 ER -