<microscopy> The smaller of the two tubes on a monocular microscope. The drawtube (if present) carries the ocular, it can be adjusted to control tube length and so effect corrections for the objective lens. The drawtube may also be convenient in calibrating an eyepiece-micrometre by allowing a minor magnification change to simplify the conver...
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http://www.encyclo.co.uk/local/20973
The sliding tube of a telescope that permits the telescope eyepiece to be moved to such a position that the telescope is in focus
Found on
http://www.irpoyser.co.uk/glossary.php
a tube sliding within another tube, as the tube carrying the eyepiece in a microscope.
Found on
https://www.infoplease.com/dictionary/drawtube
No exact match found.
