Refracting telescope on equatorial mounting, 1790-1810

Made:
1790-1810 in London
maker:
George Dollond
and
Peter and John Dollond

Refracting telescope of 2 3/4 inch aperture and 18 inch focal length by Dollond, London, on an adjustable equatorial mount with a fitted mahogany case. Accessories include, 4 eyepieces, a wedge and an ivory annulus that fits to the objective lens for illuminating cross-hairs.

Dated to the early nineteenth century, this brass telescope was made by the London instrument makers, Peter and George Dollond. The instrument has a 2 ¾-inch lens and is carried on an equatorial mount of the type first introduced by the Sissons family of instrument makers. Used in conjunction with a table, the equatorial stand could be made horizontal using the three adjusting screws and the pair of spirit levels. Once adjusted, objects could be located using the circular setting scales. A telescope this quality would have only been affordable to wealthy individual who had an interest in astronomy.

Details

Category:
Astronomy
Object Number:
1912-204
Materials:
complete, glass, ivory, mahogany and metal
Measurements:
overall (assembled): 630 mm x 500 mm x 400 mm,
type:
telescope - refracting
taxonomy:
  • disciplines
  • disciplines
  • science
  • natural sciences
  • physical sciences
  • furnishing and equipment
  • tools & equipment
  • scientific equipment
  • astronomical instrument
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • telescope
credit:
Pearson, H.

Cite this page

Rights

We encourage the use and reuse of our collection data.


Data in the title, made, maker and details fields are released under Creative Commons Zero


Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence

Using our data

Download

Download catalogue entry as json

Download manifest IIIF

Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.