![40 inch Yerkes telescope, Yerkes Observatory, Wisconsin, USA, 1915 by Warner & Swasey Company at Science and Society Picture Library 40 inch Yerkes telescope, Yerkes Observatory, Wisconsin, USA, 1915 by Warner & Swasey Company at Science and Society Picture Library](https://s3-eu-west-1.amazonaws.com/lowres-picturecabinet.com/43/main/28/106832.jpg)
40 inch Yerkes telescope, Yerkes Observatory, Wisconsin, USA, 1915 by Warner & Swasey Company at Science and Society Picture Library
![Yerkes 40-inch Refractor Telescope Photograph by Yerkes Observatory, University Of Chicago, Courtesy Emilio Segre Visual Archives/american Institute Of Physics Yerkes 40-inch Refractor Telescope Photograph by Yerkes Observatory, University Of Chicago, Courtesy Emilio Segre Visual Archives/american Institute Of Physics](https://images.fineartamerica.com/images-medium-large-5/yerkes-40-inch-refractor-telescope-yerkes-observatory-university-of-chicago-courtesy-emilio-segre-visual-archivesamerican-institute-of-physics.jpg)
Yerkes 40-inch Refractor Telescope Photograph by Yerkes Observatory, University Of Chicago, Courtesy Emilio Segre Visual Archives/american Institute Of Physics
Telescope At Yerkes Observatory Wisconsin 19th Century Stock Illustration - Download Image Now - iStock
![The Yerkes Observatory 40 inch (102 cm) refracting telescope is largest refracting telescope used scientfic research built in Stock Photo - Alamy The Yerkes Observatory 40 inch (102 cm) refracting telescope is largest refracting telescope used scientfic research built in Stock Photo - Alamy](https://c8.alamy.com/comp/D0M14R/the-yerkes-observatory-40-inch-102-cm-refracting-telescope-is-largest-D0M14R.jpg)