Sentence Examples

  • To Fraunhofer, some time not long previous to 1820, is due, so far as we can ascertain, the construction of the first heliometer with an achromatic divided object-glass, i.e.
  • But when the relative positions of two adjacent objects or scaledivisions have to be determined (as, for example, in the case of heliometer scales), much time is saved by retaining the motion of the micrometer box.
  • 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.
  • One was to use a heliometer to measure the distance between the limbs of Venus and the sun during the whole time that the planet was seen projected on the solar disk, and the other was to take photographs of the sun during the period of the transit and subsequently measure the negatives.
  • The Germans laid the greatest stress on measures with the heliometer; the Americans, English, and French on the photographic method.

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