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Unknown, 1725 c.
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Photo

photo - whole telescope
Basic Info

Maker: Unknown

Year: 1725 c.

Year Range: -

Year Notes:

Manufacturing Location: Italian [?]

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Optisches Museum

Accession #: 03/0078

Sources:

Project investigation.

Museum placard.

Public Notes:

Objective Note: Objective recessed within wooden cell, free aperture reflects opening on cell, to which end cap would screw on. End cap missing.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: unconfirmed

Optical style terrestrial

Physical style

Functional style

Materials: leather, pasteboard, gold tooling

Optical/Lab Data

Drawtube data:

Drawtube notes:

Draw 2 has beveled wood stop eyeside. Equally-spaced 3-lens eyepiece unit in Draw 5. Draws lined in paste paper. Tube measurements: 390 mm (Main tube), 257 mm (tube 1), 259 mm (tube 2), 257 mm (tube 3), 261 mm (tube 4), and 276 mm (tube 5).

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 20.10

Eyepieces

Notes:

Additional Photos/Documents