Frontispiece to J. Draper, Young Students' Pocket Companion (1772). (Copyright © The British Museum.)
Hadley telescope from Robert Smith, A Compleat System of Opticks (1738), p. 376. (Copyright © The Royal Society.)
A Herschel 7-foot reflector. (Object number AST0960, image ID F5601-001; copyright © The National Maritime Museum, London.) (Online version in colour.)
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