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pre-1775 refracting telescopes

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Mann & Ayscough, 1744
Coll. Willach

Photo

photo - whole telescope

Basic Info

Maker: Mann & Ayscough

Year: 1744

Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: Mann & Ayscough London 1744

Signature Notes:

Inscriptions:

No stand present.

Collection: Coll. Willach

Accession #: RW 147 [17147] [2006 3] [2023]

Sources:

Project investigation

Public Notes:

Galuchat (rayskin shaved and colored with red lead oxide rouge). Non-achromatic telescope with silvered end rings.

Length (open): 680

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style

Functional style

Materials: brass, glass, silver, shagreen

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						19.50	11.50

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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+ Year range:	1600 - 2014
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+ Open length range (mm):	0 - 2000
+ Closed length range (mm):	0 - 2000
+ 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

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Objective Data

Eyepieces