Maker: Marshall, John

Year: 1700 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: National Maritime Museum

Accession #: NAV1615

Sources:

Royal Museums Greenwich. "Hand-held telescope". http://collections.rmg.co.uk/collections/objects/43827.html [Accessed: June 2016].

Public Notes:

"The barrel of this non-achromatic telescope would originally have been much lighter and would have looked similar to the nine draw tubes. All the tubes are made of vellum and are decorated with gold-tooled motifs. The mounts for the lenses are made of lignum vitae. The eyepiece lens is missing. The maker's name has been stamped around the barrel at the objective end: 'IOHN MARSHALL LUDGAT STREET LONDON'. John Marshall was one of London's leading opticians, who was a contemporary of Robert Hooke and worked in Ludgate Street. Early telescope lenses suffered from the appearance of coloured fringes when viewing, a problem that could be reduced by using lenses with long focal lengths. This meant, however, that the telescopes had to be very long, hence the nine draw tubes of this example that can be pulled out to a working length that could have been as much as two metres" (Royal Museums Greenwich).

Length (open):

Length (closed): 574

F-ratio:

Exit pupil:

Object status:

Objective type: singlet

Optical style

Physical style

Functional style

Materials: vellum, wood, gold tooling, glass, pasteboard

Drawtube data:

Drawtube notes:

Diameter: 81 mm (barrel)

Objective Data

Eyepieces

Notes: