Maker: Hofmann, J. G.

Year: 1860 c.

Year Range: -

Year Notes:

Manufacturing Location: France

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Louwman Collection of Historic Telescopes

Accession #: LC 322

Sources:

Project investigation.

Cocquyt,Tiemen. "400 Years of Telescopes" booklet, Zeeuws Museum, 2008. Item 21.

Louwman, P.J.K., and Zuidervaart, H.J., "A Certain Instrument for Seeing Far: Four Centuries of Styling the Telescope Illustrated by a Selection of Treasures from the Louwman Collection of Historic Telescopes". Wassenaar, 2013. p.215, #322.

Public Notes:

"Monoocular telescope with a Porro prism (Longue-Vue-Cornet). Brass barrel covered with black leather. The handle at the side was used for focusing. Length 13 cm, Ø casing 7.5 cm. Unsigned, but made in France, probably by J.G. Hofmann. With its original leather casing. Inside the cover is a so called ‘telemeter’-scale, which was used for the estimation of distances. Ca. 1862-1865" (Louwman and Zuidervaart, 2013).

Telescope with two prisms that create an upright image. Binoculars soon manufactured using this method-- monoculars are very rare.

Length (open): 130

Length (closed):

F-ratio:

Exit pupil:

Object status:

Objective type: singlet

Optical style

Physical style

Functional style

Materials: leather, brass

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes: