Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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Dollond, 1760 c.
Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Basic Info

Maker: Dollond

Year: 1760 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: Dollond LONDON

Signature Notes:

Inscriptions:

No stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #: C III c 48

Sources:

Helmut Schramm, Astronomische Instrumente Katalogue, Staatlicher Mathematisch-Physikalischer Salon, Dresden, Zwinger, item 50, pg. 35.

Public Notes:

Telescope of brass.

Length (open): 411

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style astronomical and keplerian

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			60.00				51.50

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.

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+ Year range:	1600 - 2014
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+ 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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Objective Data

Eyepieces