Keywords: Yerkes 40 inch Refractor Telescope-1897.jpg en Yerkes Observatory 40-inch equatorial refractor en Alvan Clark and Sons en Cambridgeport Massachusetts 1897 1 020 mm refraktor Observatorija Yerkes v ekvatorialni obesi Alvan Clark and Sons Cambridgeport Massachusetts 1897 page is/was http //en wikipedia org/w/index php title Image 3AYerkes jpg here 1897 author PD-OLD 42 570280 -88 556110 PD-old Transwiki upload log Original uploader was Ericd at http //en wikipedia org en wikipedia All user names refer to en wikipedia 2003-09-18 21 08 Ericd 361×436×8 71447 bytes <nowiki></nowiki> original upload log wikitable date/time username resolution size edit summary ---- 13 05 18 December 2006 User Svencb 361×436 70 KB <nowiki> <span class comment > page is/was http // </span></nowiki> Yerkes Observatory Refracting telescopes Telescopes containing lenses ground by Alvan Clark Sons 1897 in Wisconsin |