Maker: Hooke, Robert

Year: 1721 c.

Year Range: -

Year Notes:

Manufacturing Location: England

Signature:

Signature Notes:

Inscriptions:

Stand present.

Collection: National Maritime Museum

Accession #: AST0979

Sources:

Royal Museums Greenwich. "Transit instrument". http://collections.rmg.co.uk/collections/objects/11141.html. [Accessed: June 2016].

Public Notes:

Mount made by George Graham.

Museum Description:

"This 5-foot (153 cm) telescope is the earliest at the Observatory that can definitely be associated with its history. Instruments of this sort were a relatively recent invention and Halley's was possibly the first made in England. Lighter and less expensive than a mural quadrant, they had the disadvantage that they could easily become misaligned. Halley's transit instrument, however, proved useful and remained in service, with modifications until 1750" (Royal Museums Greenwich).

Provenance:

Edmond Halley

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Objective type: unconfirmed

Optical style

Physical style

Functional style

Materials:

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes: