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Marshall, John, 1680 c.
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Photo

photo - whole telescope
Basic Info

Maker: Marshall, John

Year: 1680 c.

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: IOHN MARSHALL LVDGAT STREET LONDON” (inscribed twice on the main tube)

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-424

Sources:

Project investigation and collection website

Public Notes:

Main tube is vellum decorated with red and green spots and overlaid with gold tooled motifs. The signature appears twice in gold stamping on the main tube. The ferrules are decorated in the same way. There are eight vellum draw tubes also gold tooled. There is an inscription handwritten in ink on one of the draws. A brass lens cell carrying a doublet lens is a much later replacement for the original objective lens. The lens has many black streaks and bubbles.

Length (open): 2640

Length (closed): 540

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: doublet (crown forward)

Optical style

Physical style spyglass

Functional style

Materials: pasteboard, vellum, wood, glass, brass, gold tooling

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.:
Complete

Eyepieces

Notes:

Additional Photos/Documents