Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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Deijl, J. & H van, 1782
Utrecht University Museum

Basic Info

Maker: Deijl, J. & H van

Year: 1782

Year Range: -

Year Notes:

Manufacturing Location: The Netherlands

Signature:

Signature Notes:

Inscriptions:

Stand present.

Collection: Utrecht University Museum

Accession #: UM-150

Sources:

Correspondence w/ museum curator.

Public Notes:

Mahogany viewer tube with brass flanges for objective and eyepiece, on wooden stand, in box. With lens with a clear aperture of 43mm, the rear lens is broken into quarters. With four-lens erecting eyepiece.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: unconfirmed

Optical style

Physical style

Functional style

Materials: wood, mahogany, glass, brass

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes:

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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.

+ Include in full text search:	Maker Manufacturing Location Description Signature Accession Public notes
+ 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