File:Yerkes 40 inch Refractor Telescope-2006.jpg

to Image:Yerkes 40 inch Refractor Telescope-2005.jpg then reuploaded to this namespace by User:CarolSpears English determination method: SHA-1

DescriptionMaking the Invisible Visible- A History of the Spitzer Infrared Telescope Facility (1971–2003) - NASA Monographs in Aerospace History, No. 47 (2017)

DescriptionYerkes 40 inch Refractor Telescope-1897.jpg English: en:Yerkes Observatory, 40-inch equatorial refractor, en:Alvan Clark and Sons, en:Cambridgeport

was the largest refracting telescope in the world. Even today, it is second in size only to the 40-inch Yerkes Observatory refractor. Located in the large