Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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Ayscough, James
Louwman Collection of Historic Telescopes

Photo

photo - whole telescope

Basic Info

Maker: Ayscough, James

Year:

Year Range: 1748-1759

Year Notes:

Manufacturing Location: England

Signature: Ayscough London

Signature Notes:

Inscriptions:

No stand present.

Collection: Louwman Collection of Historic Telescopes

Accession #: LC 180

Sources:

Cocquyt, Tiemen "400 Years of Telescopes" booklet, Zeeuws Museum, 2008. Item 23.

Louwman, P.J.K., and Zuidervaart, H.J., "A Certain Instrument for Seeing Far: Four Centuries of Styling the Telescope Illustrated by a Selection of Treasures from the Louwman Collection of Historic Telescopes". Wassenaar, 2013. p.154, #180.

Public Notes:

"Small maritime telescope. Cylindrical wooden main tube, with a brass drawtube and ditto fittings. Signed: ‘Ayscough London’. Length 2643 cm, Ø 3 cm. Made between 1748 and 1759" (Louwman and Zuidervaart, 2013).

Length (open): 430

Length (closed): 260

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style

Functional style maritime

Materials: wood, brass

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data

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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+ 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
+ Collection:
+ 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

organics

metal

glass

other

Objective Data

Eyepieces