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pre-1775 refracting telescopes

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Ayscough, 1756 c.
Coll. Willach

Photo

photo - objective

Basic Info

Maker: Ayscough

Year: 1756 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: “Ayscough / LONDON”

Signature Notes:

Inscriptions:

No stand present.

Collection: Coll. Willach

Accession #: RW 060 [1] [2006 2] [2023]

Sources:

Project investigation.

Public Notes:

Earliest surviving achromat. Flint forward-- flat, white, because of lead. Crown is green, convex. 10 sided wooden tube, normal for marine telescopes.

Brass cells for lenses.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: doublet (unknown)

Optical style

Physical style polygonal

Functional style

Materials: wood, glass, brass

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data

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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+ 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