Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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Huygens, Christiaan, 1655
Utrecht University Museum

Photo

photo - objective

Basic Info

Maker: Huygens, Christiaan

Year: 1655

Year Range: -

Year Notes:

Manufacturing Location: the Netherlands

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Utrecht University Museum

Accession #: LI-38

Sources:

The Huygens Collection catalogue, Museum Boerhaave (Leiden, 1995): table IV. Louwman Collection of Historic Telescopes catalogue, p. 40.

Public Notes:

Grayish glass. Objective lens with which Christiaan Huygens discovered Saturn’s moon Titan. On the rim of the lens are engraved the focal length “X [pedes]”, the date when the lens was finished “3 FEBR. MDCLV”, and the first part of the anagram, “Admovere oculis distantia sidera nostris”. Plano-convex lens Ø 5,7 cm. Focal length measured as 336,7 cm. Radius of curvature, front: 176 cm; ibidem back: flat. Maximum thickness 0,34 cm.

Length (open): NA

Length (closed): NA

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style

Functional style

Materials: glass

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data

	C_A curvature (diopters):	C_B curvature (diopters):	P_D lens power (diopters):	f_D focal length (mm):	t thickness (mm):	free aperture (mm):	full aperture (mm):	nD refractive index:	ν Abbe No.:
Lens 1	1760.00			3367.00	3.40		57.00	1.52

Eyepieces

Notes:

Additional Photos/Documents

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Dioptrice is made possible by the generous support of the National Science Foundation, the National Endowment for the Humanities, the Program in the History and Philosophy of Science at the University of Notre Dame, and the Adler Planetarium & Astronomy Museum.

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+ Categories:	Art Collection Book or Manuscript Instrument Collection
+ Materials:	organics bamboo black ivory bone boxwood ebony fish skin horn ivory lacquer leather lignum vitae mahogany paper parchment pasteboard rayskin shagreen sharkskin tortoiseshell vellum wood metal brass copper gilt gold leaf gold tooling iron platinum tooling silver silver tooling unknown glass glass rock crystal speculum other marble paint stone
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+ Objective type:	(all refractors) (all reflectors) (clear selection) N/A cassegrain doublet (crown forward) doublet (flint forward) doublet (unknown) gregorian herschelian newtonian singlet triplet unconfirmed unknown reflector

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Objective Data

Eyepieces