photo - whole telescope

Maker: Unknown

Year: 1680 c.

Year Range: -

Year Notes:

Manufacturing Location: Unknown

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #: CIF 27

Sources:

Field research. Helmut Schramm, Astronomische Instrumente Katalogue, Staatlicher Mathematisch-Physikalischer Salon, Dresden, Zwinger, item 5, pg. 14.

Public Notes:

Purportedly connected to Hevelius, reinforcing wooden rings on ends of each draw, except 4th, now missing.

Draw 1 has extensive printed and manuscript text,

Draw 5 may have text with date

Draws covered with kleister paper.

Simple tooling on main tube, which has wooden cell now with brass fitting for objective.

Most draws have plain paper, but last draw has small traces of combed marble.

Third and last eyepiece section each have a wooden stop.

All eyepiece units have plain blue paper, wooden rings to hold lenses.

Brass objective cell - replacement?

From catalogue: 6 draws. Says that its beam-path is terrestrial, not astronomical.

Texts visible inside the telescope:

Als deine Fuerstin jauchtzt, …
Als dich o Held, verlangt…
Was ist unmoeglich [?] …
Wer lebt, dem nur hievon …
Gleichwol ist es geschehn mein Koenig
Was keener je gehofft, hat unser
Wir dencken nun nicht mehr an die….

Length (open): 2025

Length (closed): 550

F-ratio:

Exit pupil:

Object status:

Objective type: singlet

Optical style astronomical

Physical style

Functional style

Materials: paper, wood, glass, brass

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	0.39	0.72	0.58	1727.35	2.00		19.00
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	50.33						34.32
Lens 2	135.58		25.00	70.00
Lens 3	70.82		20.00	65.00	14.06
Lens 4	70.28		21.00	55.00	12.86	13.99
Lens 5			25.00	70.00
Lens 6			22.00

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	70.82		20.00		14.06

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	70.28		21.00		12.86	13.99

Eyepiece 4

	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			25.00

Eyepiece 5

	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			22.00