Sentence Examples


  • He was the inventor of the stage-micrometer, and of a form of heliometer; and in 1816 he succeeded in constructing for the microscope achromatic glasses of long focus, consisting of a single lens, the constituent glasses of which were in juxtaposition, but not cemented together.
  • The great reflecting telescope at Dorpat was manufactured by him, and so great was the skill he attained in the making of lenses for achromatic telescopes that, in a letter to Sir David Brewster, he expressed his willingness to furnish an achromatic glass of 18 in.
  • He also succeeded in constructing an almost perfectly achromatic eye-piece, still known by his name.
  • A similar argument may be applied to find at what point an achromatic lens becomes sensibly superior to a single one.
  • If not, the substitution of an achromatic lens will be of no advantage.

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