Dioptrice : pre-1775 refracting telescopes

pre-1775 refracting telescopes

e.g. “dollond”

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[unknown maker], 1750
National Museum of Ireland

Basic Info

Maker:

Year: 1750

Year Range: -

Year Notes:

Manufacturing Location:

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: National Museum of Ireland

Accession #: NMIDM:1994.17

Sources:

Acquisition source - Mr.Paul Egestorff, The Egestorff Collection, 1994. Irish National Inventory of Historic Scientific Instruments, Charles Mollan, (Samton Ltd, 1995) pg 145. Correspondence w/ museum curator.

Public Notes:

Telescope - refracting, unsigned. Non-achromatic. Early to mid 18th century. (I.N.I. No. 0595) Outer case wooden tube covered with green fish skin (shagreen); and 3-draws of green paste board; brass ferrules. Eye lens with sliding cover; eyepiece cells of lignum vitae.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: unknown reflector

Optical style

Physical style

Functional style

Materials: pasteboard, shagreen, lignum vitae, brass

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes:

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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
+ 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

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Objective Data

Eyepieces