Unknown, 1750 c.
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photo - whole telescope
Basic Info

Maker: Unknown

Year: 1750 c.

Year Range: -

Year Notes:

Manufacturing Location:


Signature Notes:


No stand present.

Collection: National Maritime Museum

Accession #: NAV1663


Royal Museums Greenwich. "combination telescope and microscope". http://collections.rmg.co.uk/collections/objects/43875.html [Accessed: June 2016].

Public Notes:

"This instrument unscrews into a number of parts which can be assembled into different optical instruments. It can be used as a telescope, but when the barrel is unscrewed a simple microscope, or flea-glass, is also revealed. Using this, a specimen stuck on a pin (now missing) can be viewed through a small lens. The other accessories include a sundial. This type of multi-purpose object was common around 1700" (Royal Museums Greenwich).

Length (open): 155

Length (closed):


Exit pupil:

Object status:

Optical Basics

Objective type: N/A

Optical style

Physical style

Functional style

Materials: bone, brass, glass, paper

Optical/Lab Data

Drawtube data:

Drawtube notes:

Diameter: 35

Objective Data



652 ± -0.04 ± 0.09 ± ±
575 ± 0 ± ±
482 ± 1.0 ± 0.1 ± ±