Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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Unknown, 1770 c.
National Maritime Museum

Photo

photo - whole telescope

Basic Info

Maker: Unknown

Year: 1770 c.

Year Range: -

Year Notes:

Manufacturing Location: England

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: National Maritime Museum

Accession #: NAV1662

Sources:

Royal Museums Greenwich. "Polygonal telescope". http://collections.rmg.co.uk/collections/objects/43874.html [Accessed: June 2016].

Public Notes:

"This non-achromatic telescope has a ten-sided mahogany barrel and a single brass draw tube. There is no mechanical stop for the draw tube. The other brass fittings include sliding eyepiece and objective lens covers" (Royal Museums Greenwich).

Provenance:

Henry Boys (RN)
William H Boys (RN)

Vessels Camperdown 1885, Vanguard (1835)

Length (open): 774

Length (closed): 665

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: unconfirmed

Optical style

Physical style polygonal

Functional style

Materials: leather, brass, silver

Optical/Lab Data

Drawtube data:

Drawtube notes:

Diameter: 35-43 mm (barrel), 52 mm (max)

Objective Data

Eyepieces

Notes:

Additional Photos/Documents

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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 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
+ 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

organics

metal

glass

other

Objective Data

Eyepieces