Unknown, 1725 c.
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Basic Info

Maker: Unknown

Year: 1725 c.

Year Range: 1725-1800

Year Notes:

Manufacturing Location: France (?)

Signature: Unknown

Signature Notes:


No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-454


Project investigation

Public Notes:

Non-telescoping (does not collapse and draw-out) bone telescope. Smooth tube except for turned banding at middle and at ends. Screw-on bone caps for both ends (objective end missing). Eyepiece end unscrews; bone is very brittle. Only lens present is eyepiece lens, which is loose (may not be original). Inside tube at center is a cross piece of a dark resin, or glue. Wooden tube-case is fashioned similar to telescope, with smooth tube and turned bands at center and ends. Objective end has screw-on, turned wood cap. Eyepiece end has turned finial.

Length (open): 425 mm

Length (closed): 425 mm by 32 mm diameter


Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style

Functional style

Materials: bone, glass, wood

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data