Astronomical Photography With The Forty-Inch Refractor And The Two-Foot Reflector Of The Yerkes Observatory (1904) - Hardcoverby George Willis Ritchey (Author) ""Astronomical Photography With The Forty Inch Refractor And The Two Foot Reflector Of The Yerkes Observatory"" is a book written by George Willis Ritchey in 1904. The book details the techniques and processes involved in capturing astronomical photographs using the state of the art equipment available at the Yerkes Observatory in Wisconsin, USA. The observatory was home to two powerful telescopes a 40 inch refractor