Ayscough, 1756 c.
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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 #: 1

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: