Maker: Unknown

Year: 1750 c.

Year Range: -

Year Notes:

Manufacturing Location: England

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: National Maritime Museum

Accession #: NAV1597

Sources:

Royal Museums Greenwich. "Non-achromatic telescope". http://collections.rmg.co.uk/collections/objects/43809.html [Accessed: June 2016].

Public Notes:

"This is not a complete telescope, it is four draw tubes from a larger example. The surviving tubes are made of vellum, while the brass fittings include a sliding eyepiece cover. Stop lines, mostly rings of dots, on the draw tubes, indicate the optimum working length of the telescope. The barrel and objective lens, and perhaps some other draw tubes, are missing. This would have been a non-achromatic telescope" (Royal Museums Greenwich).

Length (open):

Length (closed): 270

F-ratio:

Exit pupil:

Object status:

Objective type: unconfirmed

Optical style

Physical style

Functional style

Materials: vellum, glass, brass

Drawtube data:

Drawtube notes:

Diameter: 38 mm

Objective Data

Eyepieces

Notes: