Cock, Christopher, 1675 c.25
Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden Arrow right Arrow left
Photo

photo - whole telescope
Basic Info

Maker: Cock, Christopher

Year: 1675 c.25

Year Range: -

Year Notes:

Manufacturing Location: England

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #: CIF 32

Sources:

Helmut Schramm, Astronomische Instrumente Katalogue, Staatlicher Mathematisch-Physikalischer Salon, Dresden, Zwinger, item 1, pg. 14. Field research.

Public Notes:

Seven draws. On draw one, someone has drawn on surface the location of the first ocular lens (but it's located at inked extension mark, rather!) All draws have inked extension marks. All draws have aperture, reinforcement rings. Eyepiece lenses, especially 3rd one (next to eye) have greenish tint.

Paper tubes. Outermost of white, green, and brown-flecked parchment; inner tubes of white parchment. Ocular tube bears goal-leaf coat of arms. Similar to scopes by Christopher Cock, though catalogue states this telescope likely by "J. M. Dobler Opticus Berolini."

Length (open): 1780

Length (closed): 565

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style terrestrial

Physical style spyglass

Functional style

Materials:

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 0.78 0.77 0.79 1271.00 23.00
Complete

Eyepieces

Notes:

Eyepiece 1
fD focal length (mm): free aperture (mm): full aperture (mm): s spacing (mm): CA curvature (diopters): CB curvature (diopters): M magnification: FOV field of view (degrees): Thickness:
Lens 1 50.23 25.30
Lens 2 87.73 35.00 195.00 10.69 10.67
Lens 3 103.19 39.00 195.00 9.21 9.21
Lens 4 60.50 36.00 18.43 13.31
Eyepiece 2
fD focal length (mm): free aperture (mm): full aperture (mm): s spacing (mm): CA curvature (diopters): CB curvature (diopters): M magnification: FOV field of view (degrees): Thickness:
Lens 1 103.19 39.00 9.21 9.21
Eyepiece 3
fD focal length (mm): free aperture (mm): full aperture (mm): s spacing (mm): CA curvature (diopters): CB curvature (diopters): M magnification: FOV field of view (degrees): Thickness:
Lens 1 60.50 36.00 18.43 13.32