Definitions
from The Century Dictionary.
- noun 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.
- noun One of the overlapping movable tubes of a field-glass or telescope.
Etymologies
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Examples
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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 Francis Galton 1866
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"Two, with the draw-tube closed," replied Thorndyke, "and the low-power eye-piece brings it up to four.
The Red Thumb Mark 1902
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