Drawtube
(Science: 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 conversion factor.
Drawtube (Science: 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..
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