How to use Refractors in a sentence

refractors
  • In recent years no noteworthy refractors have been mounted on Great this plan; but type A has been chosen by Grubb for the Me!- great Melbourne reflector, of 48-in.

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  • Type C. - Many more telescopes have been made of type C than of any other, and this form of mounting is still most generally employed for the mounting of modern refractors.

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  • Both the Dorpat and the Pulkovo refractors are defective in rigidity, especially in right ascension.

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  • Newton failed to perceive the existence of media of different dispersive powers required by achromatism; consequently he constructed large reflectors instead of refractors.

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  • Having access to large refractors made the task easier.

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