Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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Ramsden, Jesse, 1775 c.
Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Basic Info

Maker: Ramsden, Jesse

Year: 1775 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: RAMSDEN LONDON

Signature Notes:

Inscriptions:

No stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #: CIF 52

Sources:

Helmut Schramm, Astronomische Instrumente Katalogue, Staatlicher Mathematisch-Physikalischer Salon, Dresden, Zwinger, item 9, pg. 16.

Public Notes:

Six draws. All tubes of brass, tube-ends as well as lens mounts and objective cap with [Randelung.] Achromatic objective-- forward and rearward lenses biconvex, middle biconcave.

Length (open): 343

Length (closed): 102

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: triplet

Optical style terrestrial

Physical style

Functional style

Materials:

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.

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+ Year range:	1600 - 2014
+ Focal length range (mm):	0 - 2000
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+ Closed length range (mm):	0 - 2000
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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