from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument used to measure the magnification of a telescope.
from the GNU version of the Collaborative International Dictionary of English
- n. A dynamometer.
- n. 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 The Century Dictionary and Cyclopedia
- n. An instrument for determining the magnifying power of telescopes.
Sorry, no etymologies found.