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Example sentences for "refractors"

Lexicographically close words:
refractions; refractive; refractometer; refractor; refractories; refractory; refracts; refrain; refraine; refrained
  1. And since photographic refractors are corrected for the blue rays, exposures with them of orthochromatic surfaces would be entirely futile.

  2. Professor Pickering sketched, in 1881, a plan for fixing large refractors in a permanently horizontal position, and reflecting into them, by means of a shifting mirror, the objects desired to be observed.

  3. From refractors it was obvious that no such vast and rapid advance could be expected.

  4. Refractors have always been found better suited than reflectors to the ordinary work of observatories.

  5. The great obstacle which long stood in the way of the improvement of refractors was the defect known as "chromatic aberration.

  6. Mr. Dawes is, we believe, now engaged in testing reflectors, and his unequalled experience of refractors will enable him to pronounce decisively on the relative merits of the two classes of telescopes.

  7. This is the most serious defect of all the great refractors of the day, and effectively it limits their size to about 60 inches of aperture, with present types of flint and crown.

  8. It affords exceptional facilities for rapid and convenient observing, as for variable stars, and is adaptable to both refractors and reflectors.

  9. In refractors there is a twofold difficulty to be overcome.

  10. The perfect achromatism of a reflector is, of course, a great advantage, but the chromatic aberration of refractors is now so well corrected that their inferiority in that respect may be disregarded.

  11. You can see, on the old moon, an edifice two hundred feet long with any of the fine refractors of our day.

  12. The largest refractors in the world to-day are in the United States, i.

  13. As regards refractors there are several strong reasons against augmenting their proportions.

  14. With regard to the various merits of refractors and reflectors much might be said.

  15. Hale, concludes that the limit of refractors is about five feet in diameter, but he thinks that reflectors as large as nine feet in diameter might now be made.

  16. Frauenhofer was succeeded by Merz and Mahler, who carried out his views, and turned out the famous refractors of Pulkowa Observatory in Russia, and of Harvard University in the United States.


  17. The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "refractors" in a variety of sentences. We hope that you will now be able to make sentences using this word.