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pre-1775 refracting telescopes

e.g. “dollond”

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Sterrop, 1790 c.
Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Photo

photo - signature

Basic Info

Maker: Sterrop

Year: 1790 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: Sterrop LONDON

Signature Notes:

Inscriptions:

No stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #: CIF 21

Sources:

Helmut Schramm, Astronomische Instrumente Katalogue, Staatlicher Mathematisch-Physikalischer Salon, Dresden, Zwinger, item 14, pg. 17. Images from project investigation.

Public Notes:

Middle tube of brown wood, thickness 2.5 mm, with cover of green-dyed fish skin. Objective and ocular side pulls; both pulls as well as objective and ocular lens mounts of gold-plated brass. Two objective lenses in [Wurfelrevolver], simple convex. Signature on the lens turret.

Length (open): 565

Length (closed): 376

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: doublet (unknown)

Optical style terrestrial

Physical style

Functional style

Materials:

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			8.00				133.00
Lens 2			13.00

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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+ 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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Objective Data

Eyepieces