Maker: Graham, George

Year: 1727

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature:

Signature Notes:

Inscriptions:

Stand present.

Collection: National Maritime Museum

Accession #: AST0992

Sources:

Royal Museums Greenwich. "Zenith sector". http://collections.rmg.co.uk/collections/objects/11154.html [Accessed: June 2016].

Clifton, Gloria, and Nigel Rigby. "Treasures of the National Maritime Museum". London: National Maritime Museum, 2009.

Public Notes:

Zenith sector:
"This telescope was constructed by George Graham in 1727 for Bradley's personal use in studying the parallax of the star Gamma Draconis. When he was appointed third Astronomer Royal in 1742, Bradley only agreed to bring this instrument to Greenwich after the Government paid him the princely sum of £45 for it. With it he discovered two major phenomena: the aberration of light and the nutation (wobbling) of the Earth's axis. It was used at Greenwich until 1837" (Royal Museums Greenwich).

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Objective type: N/A

Optical style

Physical style

Functional style

Materials: iron, unknown

Drawtube data:

Drawtube notes:

Overall: 3810 x 72 mm

Objective Data

Eyepieces

Notes: