Maker: Unknown

Year: 1680 c.

Year Range: 1670-1700

Year Notes:

Manufacturing Location: England

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: National Maritime Museum

Accession #: NAV1545

Sources:

Royal Museums Greenwich. "Non-achromatic telescope". http://collections.rmg.co.uk/collections/objects/43757.html [Accessed: June 2016].

Public Notes:

"This non-achromatic telescope is made of vellum with turned wooden fittings. The barrel is decorated with tooled motifs as are the collars of the six draw tubes, which are otherwise plain. All the lenses are now missing. Unusually, the eyepiece of this telescope was at the end of the barrel, rather than at the end of the smallest draw tube. Stop lines drawn onto the tubes indicate the telescope's optimum working length of over two metres. This suggests that it would have been used with some sort of support" (collections.rmg.co.uk).

Length (open): 2090

Length (closed): 620

F-ratio:

Exit pupil:

Object status:

Objective type: singlet

Optical style terrestrial

Physical style

Functional style

Materials: vellum, boxwood

Drawtube data:

Drawtube notes:

Reverse taper.

Objective Data

Eyepieces

Notes: