The exquisite telescopes crafted by Alvan Clark and his sons helped make the last half of the 19th century a golden age of astronomy.
http://www.smithsonianmagazine.com/issues/2001/october/refractors.php
Exhibition from the Royal Observatory, Greenwich, that explains the history of this telescope via words and archive photographs.
http://www.nmm.ac.uk/server.php?request=setTemplate:singlecontent&contentTypeA=conWebDoc&contentId=354&navId=005001004
Describes the modernization of the Greenwich Observatory. From the BBC History series.
http://www.bbc.co.uk/history/discovery/revolutions/airy_george_01.shtml
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