Lexic.us

Medical Definition of Drawtube

1. 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. (05 Aug 1998)

Lexicographical Neighbors of Drawtube

Literary usage of Drawtube

Below you will find example usage of this term as found in modern and/or classical literature:

1. Microscopes and Accessories ... Catalogue A. by Bausch & Lomb Optical Company (1900)
"The Bertrand lens for magnifying the interference figure is carried in a slot in the drawtube, the drawtube being adjustable by rack and pinion. ..."

2. The Measurement of High Temperatures by George Kimball Burgess, Henri Le Chatelier (1912)
"The drawtube can easily be set to 2 mm. when focusing, and as the image is over 20 cm. from the objective in all cases, the resulting error in intensity due ..."

3. High-temperature Measurements by Henri Le Chatelier, Octave Boudouard (1912)
"The drawtube can easily be set to 2 mm. when focusing, and as the image is over 20 cm. from the objective in all cases, the resulting error in intensity due ..."

4. Description and Instructions for Use of Warner and Swasey Azimuth Instrument by United States Army. Ordnance Dept, Ordnance Dept, Army, United States (1917)
"surface of the telescope, the drawtube (7A) is operated by means of a ... The drawtube moves in the focusing sleeve and carries the cross wire holder (7B), ..."

5. Proceedings by Philadelphia County Medical Society (1888)
"This latter with the vernier and nomus fits into the microscope instead of the drawtube. The analyzer or scale can be so adjusted that when the nomus points ..."

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