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drawtube
drawtube n. 
/ˈdrɔːtʃuːb/, /ˈdrɑˌt(j)ub/ a tube fitted inside another tube through which it can slide; spec. that which holds the eyepiece in a monocular microscope or telescope.
Brit. /ˈdrɔːtjuːb/
, /ˈdrɔːtjuːb//ˈdrɔːtʃuːb/U.S. /ˈdrɔˌt(j)ub/
, /ˈdrɔˌt(j)ub//ˈdrɑˌt(j)ub/ΚΠ
1728 E. Chambers Cycl. at Eye Artificial Eye... In the Inside, have a short draw-Tube G, with a Lens Convex on both Sides, to do the Office of the Crystalline therein.
1817 A. Rees Cycl. (1819) XXXVI. at Tube The Construction of a Draw-tube for a Telescope.
1892 S. H. Gage Microscope & Histol. 18 To push in the draw-tube, grasp the large milled ring of the ocular with one hand, and the milled head of the coarse adjustment with the other.
1995 Sky & Telescope May 43 (advt.) Digital ReadOut (DRO) from Jim's Mobile Inc. is an electronic device that displays the position of a telescope's drawtube.
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