Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

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Unknown, 1790 c.
Adler Planetarium and Astronomy Museum

Photo

diagram

Basic Info

Maker: Unknown

Year: 1790 c.

Year Range: -

Year Notes:

Manufacturing Location: Germany

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-444

Sources:

Public Notes:

Objective glass has ground edges, not quite round; pale green/yellow glass.
Main tube is 54 mm in diameter, covered with impressed wallpaper, a floral green/gold design. Inside of tube is black. Five draw tubes, but the fifth (eye end) does not draw. Draws covered with red/yellow/purple marbled (smear pattern) paper. Ferrules are made of card and covered in same sort of wallpaper as main tube. Ends of the first 3 draws have black aperture disks. All draws have one extension mark in black.

Length (open): 1420

Length (closed): 490

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style astronomical

Physical style

Functional style

Materials: wood, pasteboard, paper, brass, glass

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data

	C_A curvature (diopters):	C_B curvature (diopters):	P_D lens power (diopters):	f_D focal length (mm):	t thickness (mm):	free aperture (mm):	full aperture (mm):	nD refractive index:	ν Abbe No.:
Lens 1			1.00 ± 0.003	1001.00 ± 3
Complete

Eyepieces

Notes:

Eyepiece 1

	f_D focal length (mm):	free aperture (mm):	full aperture (mm):	s spacing (mm):	C_A curvature (diopters):	C_B curvature (diopters):	M magnification:	FOV field of view (degrees):	Thickness:
Lens 1	61.30
Lens 2	53.70
Lens 3	47.70

Eyepiece 2

	f_D focal length (mm):	free aperture (mm):	full aperture (mm):	s spacing (mm):	C_A curvature (diopters):	C_B curvature (diopters):	M magnification:	FOV field of view (degrees):	Thickness:
Lens 1	53.50

Eyepiece 3

	f_D focal length (mm):	free aperture (mm):	full aperture (mm):	s spacing (mm):	C_A curvature (diopters):	C_B curvature (diopters):	M magnification:	FOV field of view (degrees):	Thickness:
Lens 1	47.70

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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

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glass

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Objective Data

Eyepieces