Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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Ayscough, 1755 c.
Coll. Willach

Photo

photo - whole telescope

Basic Info

Maker: Ayscough

Year: 1755 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: Ayscough / LONDON / t / Inv et Fecit [side one], Short / Long [side two], No 365 [side three]

Signature Notes:

Inscriptions:

No stand present.

Collection: Coll. Willach

Accession #: RW 125 [41] [2006 10 2008 27]] [2023]

Sources:

Project investigation.

Public Notes:

Probably soon after 1755. Two settings for longer or shorter. Fits in box. Later model of the Ayscough rotator.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: unconfirmed

Optical style multiple objective

Physical style

Functional style

Materials: brass, wood, glass

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
+ 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