Maker: Unknown

Year: 1750 c.

Year Range: -

Year Notes:

Manufacturing Location: England

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: National Maritime Museum

Accession #: NAV1552

Sources:

Royal Museums Greenwich. "Non-achromatic telescope". http://collections.rmg.co.uk/collections/objects/43764.html [Accessed: June 2016].

Public Notes:

"This non-achromatic telescope has four draw tubes made of green vellum, while the barrel is covered in black sharkskin. The other fittings, including a sliding eyepiece lens cover, are made of turned wood and brass. Stop lines, shown by rings of black dots on the draw tubes, indicate the telescope's optimum working length. The objective lens is missing" (Royal Museums Greenwich).

Length (open):

Length (closed): 300

F-ratio:

Exit pupil:

Object status:

Objective type: singlet

Optical style

Physical style

Functional style

Materials: brass, glass, wood, vellum, sharkskin

Drawtube data:

Drawtube notes:

Diameter: 48 mm

Objective Data

Eyepieces

Notes: