Dall-Kirkham reflecting telescope, 1960-1975

Made:
1960-1975 in Luton
maker:
Horace Edward Dall

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Folding amateur telescope. Dall-Kirkham Cassegrain reflecting telescope of folding design, aperture 3.25 inches, its
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Folding amateur telescope. Dall-Kirkham Cassegrain reflecting telescope of folding design, aperture 3.25 inches, its
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Folding amateur telescope. Dall-Kirkham Cassegrain reflecting telescope of folding design, aperture 3.25 inches, its
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group
© The Board of Trustees of the Science Museum

Dall-Kirkham Cassegrain reflecting telescope of folding design, aperture 3.25 inches, its mirror is chipped, plus spare mirror (also chipped), in carrying pouch

Dated from 1960-75, this miniature reflecting telescope was built and designed by the amateur astronomer, Horace Dall. Fitted with a 3 ¾-inch main mirror, the whole telescope folds flat for a carrying pouch that will fit inside a person's pocket. The instrument uses an optical configuration now known as the Dall-Kirkham design, an adaptation of the earlier Cassegrain system first proposed in 1672. Dall conceived of his modifications in 1928 and corresponded on its merits with fellow amateur, Allan Kirkham in Oregon, America. Later the design was described in the journal, 'Scientific American' under the title of, 'Dall-Kirkham' a name that has stuck ever since.

Details

Category:
Astronomy
Object Number:
1987-528/6
Materials:
glass and metal
Measurements:
overall (assembled): 110 mm x 250 mm x 115 mm,
overall (closed): 40 mm x 210 mm x 110 mm, .3kg
type:
telescope - reflecting
taxonomy:
  • disciplines
  • disciplines
  • science
  • natural sciences
  • physical sciences
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • telescope
  • telescope - reflecting
  • telescope - cassegrain
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • telescope
credit:
Dall, H.

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