Maker: Unknown, Italian or possibly French

Year: 1630 c.

Year Range: -

Year Notes:

Manufacturing Location: Italy or France

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-421

Sources:

Public Notes:

Trumpet-shaped main tube covered with gold-tooled brown leather. Five draws with equi-diameter ferrules. Large objective lens stopped down by a leather-covered diaphragm with gold sunburst motif. Edges of lens are chipped all around.

Since the tube length of the telescope is approximately equal to the focal length of the objective, it was most likely a Galilean form telescope. Its original eyepiece was therefore a simple negative lens but it has been replaced by an irregular shaped piece of poor quality glass with little or no optical power. It was most likely added only for display and serves no optical function in the telescope.

Length (open): 700 mm

Length (closed): 268 mm by 76 mm diameter

F-ratio:

Exit pupil:

Object status:

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: leather, pasteboard, glass, gold tooling

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes: