Gilbert, John, 1780 c.
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photo - whole telescope
Basic Info

Maker: Gilbert, John

Year: 1780 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: J. GILBERT / Tower Hill, / London

Signature Notes:


No stand present.

Collection: National Maritime Museum

Accession #: NAV1601


Royal Museums Greenwich. "Non-achromatic telescope". [Accessed: June 2016].

Public Notes:

"The barrel of this non-achromatic telescope is covered with plaited whip cord. It has a single brass draw tube and brass fittings that include sliding eyepiece and objective lens covers. The telescope is likely to have been used for making general observations from the deck of a ship. The maker, whose name is inscribed on the draw tube as 'J. GILBERT / Tower Hill, / London', is probably John Gilbert, who was working in Tower Hill in this period" (Royal Museums Greenwich).

Length (open):

Length (closed): 347


Exit pupil:

Object status:

Optical Basics

Objective type: unconfirmed

Optical style

Physical style

Functional style

Materials: glass, brass, unknown

Optical/Lab Data

Drawtube data:

Drawtube notes:

Diameter: 37 mm

Objective Data