Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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Longland, William, 1690 c.
National Maritime Museum, Greenwich (London), England
NAV1587

Unknown, 1660
National Maritime Museum, Greenwich (London), England
NAV1556

Unknown, 1750 c.
National Maritime Museum, Greenwich (London), England
NAV1495

Unknown, 1740 c.
National Maritime Museum, Greenwich (London), England
NAV1499

Marshall, John, 1700 c.
National Maritime Museum, Greenwich (London), England
NAV1615

Watkins, 1760 c.
National Maritime Museum, Greenwich (London), England
NAV1535

Unknown, 1710 c.
National Maritime Museum, Greenwich (London), England
NAV1544

Unknown, 1700 c.
National Maritime Museum, Greenwich (London), England
NAV1555

Unknown, 1710 c.
National Maritime Museum, Greenwich (London), England
NAV1523

Unknown, 1720 c.
National Maritime Museum, Greenwich (London), England
NAV1538

Dioptrice is made possible by the generous support of the National Science Foundation, the National Endowment for the Humanities, the Program in the History and Philosophy of Science at the University of Notre Dame, and the Adler Planetarium & Astronomy Museum.

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+ Look for Non-Blank Fields:	Maker Signature Year Manufacturing Location Inscriptions Provenance Drawtube Notes Public Notes Private Notes Objective Focal Length Eyepiece Focal Length Objective Notes Eyepiece Notes Magnification
+ Year range:	1600 - 2014
+ Focal length range (mm):	0 - 2000
+ Free aperture range (mm):	0 - 2000
+ Full aperture range (mm):	1600 - 2014
+ Open length range (mm):	0 - 2000
+ Closed length range (mm):	0 - 2000
+ Categories:	Art Collection Book or Manuscript Instrument Collection
+ Materials:	organics bamboo black ivory bone boxwood ebony fish skin horn ivory lacquer leather lignum vitae mahogany paper parchment pasteboard rayskin shagreen sharkskin tortoiseshell vellum wood metal brass copper gilt gold leaf gold tooling iron platinum tooling silver silver tooling unknown glass glass rock crystal speculum other marble paint stone
+ Collection:
+ Objective type:	(all refractors) (all reflectors) (clear selection) N/A cassegrain doublet (crown forward) doublet (flint forward) doublet (unknown) gregorian herschelian newtonian singlet triplet unconfirmed unknown reflector

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