Browse About

Sign In

Unknown, 1650 c.
Louwman Collection of Historic Telescopes Arrow right Arrow left
Photo

photo - whole telescope
Basic Info

Maker: Unknown

Year: 1650 c.

Year Range: -

Year Notes:

Manufacturing Location: Netherlands

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Louwman Collection of Historic Telescopes

Accession #: LC 15

Sources:

Project investigation. Boerhaave exhibit.

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, 2009. p. 58.

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. 35, #15.

Public Notes:

"Early spyglass with fixed focus, made of bone. Length ca. 11 cm. Virtually identical in shape and size as similar instruments recovered in archaeological excavations in Amsterdam. Cf. Rijkelijkhuizen (2011). Presumably mid-seventeenth century" (Louwman and Zuidervaart 2013, p. 35).

Length (open): 110

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style pocket

Functional style

Materials: bone, glass

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data

CA curvature (diopters): CB curvature (diopters): PD lens power (diopters): fD focal length (mm): t thickness (mm): free aperture (mm): full aperture (mm): nD refractive index: ν Abbe No.:
Lens 1 25.00

Eyepieces

Notes:

Additional Photos/Documents