Maker: Ramsden, Jesse

Year: 1780 c.20

Year Range: 1760-1800

Year Notes:

Manufacturing Location: England

Signature: Ramsden London

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: N-65

Sources:

Public Notes:

Main tube has maker's signature. End cap missing. Achromatic lens has screw-in, brass mount with milled edges. Screw-on brass tube mount contains one draw tube with screw-on eyepiece. Draw tube has two lenses. A second tube, stored inside the pillar stand, screws onto the inner end of the draw tube. It also has two lenses and may be missing a third. Combined, the parts make a draw (erector) tube with four, possibly five, lenses.

Length (open):

Length (closed): 202 mm by 41 mm diameter

F-ratio:

Exit pupil:

Object status:

Objective type: triplet

Optical style

Physical style spyglass

Functional style

Materials: brass, glass

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes: