Definitions

from The Century Dictionary.

  • noun An instrument for determining the magnifying power of telescopes.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A dynamometer.
  • noun (Opt.) An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnifying power.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An instrument used to measure the magnification of a telescope.

Etymologies

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