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pre-1775 refracting telescopes

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Ramsden, Jesse, 1780 c.
Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Basic Info

Maker: Ramsden, Jesse

Year: 1780 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: J. Ramsden London

Signature Notes:

Inscriptions:

Stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #: CIF 6

Sources:

Helmut Schramm, Astronomische Instrumente Katalogue, Staatlicher Mathematisch-Physikalischer Salon, Dresden, Zwinger, item 29, pg. 21.

Public Notes:

A three-footed tripod of 1035 mm in height with cross-braces and assembled with brass screws. The lower outer column has a height of 484 mm and 645 mm and 51 mm lower and upper diameter. Azimuthal mount. Objective tube of mahogany. Ocular tube of brass. Objective lens a simple biconvex.

Length (open): 750

Length (closed): 670

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style astronomical

Physical style

Functional style

Materials: mahogany, wood, glass, brass

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			9.00	740.00			75.80

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
+ 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