Patroni, Pietro, 1720 c.
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Photo

photo - whole telescope
Basic Info

Maker: Patroni, Pietro

Year: 1720 c.

Year Range: 1714-1722

Year Notes:

Manufacturing Location: Italy

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-460

Sources:

Project investigation and collection website

Public Notes:

Presumably Italian made telescope. It appears that Black sharkskin coversthe main tube without tooling. Five draw tubes covered with gold-tooled green vellum, badly soiled in several places. Ivory eyepiece mounting. Tube containing lenses 1 and 2 in the eyepiece is reversible. With "grande" side out, the data is as given under eyepiece 1. With the "chiaro" side out data is given under eyepiece 2, and the combination focal length is 55.9 mm and M = 9.1.

Length (open): 1060

Length (closed): 320

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: glass, sharkskin, pasteboard, leather, ivory, horn, wood, vellum

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 1.91 ± 0.007 -1.90 ± 0.007 1.96 ± 0.012 509.00 ± 3 1.98 23.00 1.52 ± 0.003 54.00 ± 3
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 48.90
Lens 2 43.20
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 55.90
Lens 2 48.90
Lens 3 49.00
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 48.90