The 28-inch Photo-visual Refractor
http://www.nmm.ac.uk/server.php?request=setTemplate:singlecontent&contentTypeA=conWebDoc&contentId=354&navId=005001004Exhibition from the Royal Observatory, Greenwich, that explains the history of this telescope via words and archive photographs.
Submitted in section: Astronomy: History: Instruments: The 28-inch Photo-visual Refractor