Maker: Unknown

Year: 1730 c.

Year Range: -

Year Notes:

Manufacturing Location:

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: National Maritime Museum

Accession #: NAV1521

Sources:

Royal Museums Greenwich. "Non-achromatic telescope". http://collections.rmg.co.uk/collections/objects/43733.html. [Accessed: June 2016].

Public Notes:

"This non-achromatic telescope has four draw tubes made of vellum and decorated with gold-tooled motifs. Unusually, it has a tortoiseshell barrel inlaid with silver, and ivory and silver fittings, including a sliding objective and eyepiece lens covers. Stop lines on the draw tubes indicate the optimum working length of the telescope. It is also interesting to note that the aperture of the objective lens cover is much smaller than the objective lens. It was easier at this time to make a larger lens of good quality and then to stop this down to the size required" (Royal Museums Greenwich).

Provenance:

Caird Collection.

Length (open):

Length (closed): 312

F-ratio:

Exit pupil:

Object status:

Objective type: singlet

Optical style

Physical style

Functional style

Materials: tortoiseshell, vellum, silver, glass, ivory, gold tooling

Drawtube data:

Drawtube notes:

Diameter: 46 mm (barrel)

Objective Data

Eyepieces

Notes: