Smithsonian Report, 1925.—Abbot PLATE 1 
THE PLEIADES, G. W. RITCHEY 
Photographed with the 2-foot reflector of the Yerkes Observatory, 1991, October 19. 
Exposure, 314 hours. Cramer Crown plate. From “The Sun,” by C. G. Abbot. 
Published by Appleton & Co., 1911 
