Maker: Ayscough, James

Year: 1754

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: Ayscough London Inv et Fecit No 185 [on objective], Ayscough / LONDON / Inv t et Fecit [side 1 of eyepiece], No 365 [side 2 of eyepiece], Short [side 3 of eyepiece]

Signature Notes:

Inscriptions:

No stand present.

Collection: Coll. Willach

Accession #: RW 036 [40] [2023 04] [2023]

Sources:

Project investigation.

Public Notes:

Only two survive. Includes sheet describing how it works. Long focus-- extend tube at both ends, higher magnification, calmer sea. Shorter focus-- push tubes in, lower mag, rough seas. This lens is cracked.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Objective type: unconfirmed

Optical style multiple objective

Physical style

Functional style maritime

Materials: brass, glass

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes: