'Yale 26 inch refractor' presentation slideshows

Schlesinger's Telescope: A History of the Yale 26-inch Refractor in The Commonwealth

Schlesinger's Telescope: A History of the Yale 26-inch Refractor in The Commonwealth. William van Altena and Dorrit Hoffleit Yale University (IAU Commission 8 - July 16, 2003). Frank Schlesinger (1871-1943). Yerkes (1903-1905) 40-inch refractor and the first modern parallax program.

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