Maker: Unknown

Year:

Year Range: 1700-1800

Year Notes:

Manufacturing Location:

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Utrecht University Museum

Accession #: UM-447

Sources:

Correspondence w/ museum curator.

Public Notes:

Biconvex lenses each mounted in a 3 cm long cardboard tube. One tube has a diameter of 4.35cm, the other of 4.2cm. On the tube of 4.35cm is the old inventory number '1838 '. In the catalog of 1839 under the number 1838 is registered Huygens Lens Admovere (li 38). Later there is added in pencil 'two eyepieces', that is, these two lenses. The lens '1838' has f = 77.87mm, r1 = 81.16, r2 = 80.88, d = 5.5, n = 1,526. The other lens f = 58mm, r1 = 59.31, r2 = 59.21, d = 6.42, n = 1,521.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Objective type: unconfirmed

Optical style

Physical style

Functional style

Materials: pasteboard, glass

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes: