Italian draw-tube refracting telescope, 1714-1722

Made:
1714-1722 in Milan and Italy
Italian draw-tube refracting telescope, on altazimuth wooden stand  17th-18th century. (1912-215 - centre)
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Italian draw-tube refracting telescope, on altazimuth wooden stand 17th-18th century. (1912-215 - centre) Cardboard
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Telescope by Pietro Patroni, Milan, with non-achromatic objective lens and 5-draw tube.

Dated to the first quarter of the eighteenth century, this refracting telescope was made by Pietro Patroni in Milan, Italy. The telescope has simple objective and eyepiece lenses mounted in ivory. When fully extended the five drawtubes of the instrument measure over three feet, but only eleven inches when closed. The tube of the telescope is made of card and leather, while the drawtubes are green vellum with gold decorative tooling. Unlike Galileo's telescopes this one is fitted with convex eyepiece lenses as first suggested by the astronomer Johannes Kepler in 1611. This gives a much wider field of view than in Galileo's telescopes while the inverted image can be made upright by adding an extra convex lens.

Details

Category:
Astronomy
Materials:
glass, ivory and leather
Measurements:
overall (open): 870 x 40 mm
Identifier:
1940-29
type:
refracting telescopes
taxonomy:
  • disciplines
  • disciplines
  • science
  • natural sciences
  • physical sciences
credit:
Christie, Manson and Woods Limited