draw tube

draw tube

A simple tube of 31.75, 25.4, or 50 mm bore into which fits the telescopic eyepiece in use. It is equipped with a mechanism, such as a rack and pinion, allowing fine adjustment of the eyepiece position in order to obtain a sharp focus.
References in periodicals archive ?
The unit also had plenty of range; I had no problem bringing any camera or eyepiece combination into focus, though I secured the draw tube lock knob when imaging.
Cell-Free DNA BCT, a direct-draw tube for the collection and preservation of whole blood samples, is now available as a 2.0 mL draw tube. Cell-Free DNA BCT is a direct-draw blood collection tube with a formaldehyde-free preservative stabilizing nucleated blood cells.
* UPR's come with a built-in air cylinder, so there is no need for a separate actuator and draw tube.
The seals protect the spindle, collet body, and draw tube from chips and coolant.
Ideally, when the focuser is assembled, the shaft is nice and snug against the draw tube, but not so tight that it bends.
In late 2011, a new blood draw tube was rolled out for the collection of MaterniT21 samples, allowing for blood to be drawn directly at a doctor's office and shipped at ambient temperature, the company said.
Eliminating the conventional draw tube and external actuator, air is used only to open the chuck.
The estimate for a 13-mm x 75-mm, 4-mL draw tube is ~3 psi.
It displays the position of the focuser's draw tube to an accuracy of 0.01 mm.
The length of the focuser's draw tube and the dimensions of the secondary cage ensure that stray light can't reach the focal plane and flood the view with a contrast-killing glow.