Definitions

from The Century Dictionary and Cyclopedia

  • n. In a microscope, the tube which carries the eyepiece and object-glass. It consists of two parts, one sliding within the other, so that its length can be varied at will.
  • n. One of the overlapping movable tubes of a field-glass or telescope.

Etymologies

Sorry, no etymologies found.

Examples

  • By its means the ordinary image of one component is thrown upon the extraordinary image of the other, and the composite may be viewed by the naked eye, or through a lens of long focus, or through an opera-glass (a telescope is not so good) fitted with a sufficiently long draw-tube to see an object at that short distance with distinctness.

    Inquiries into Human Faculty and Its Development

  • "Two, with the draw-tube closed," replied Thorndyke, "and the low-power eye-piece brings it up to four.

    The Red Thumb Mark

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