Interchangeable, replaceable tube assemblies were used for each bit of the processor.
He got a shovel from inside the ship and walked around to the tube assembly, the dew on the grass dampening his canvas work shoes.
The focal plane is at an asymmetrical point and at the top of the optical tube assembly.
Some designs provide mechanisms for rotating the eyepiece mount or the entire tube assembly to a better position.
For intestinal perfusion a tube assembly with a proximal occluding balloon was used.
There are modern commercial and amateur mount designs for Newtonian telescopes that have the "ball" built into the base of the optical tube assembly.
He brought with him an optical tube assembly for a 6-inch f/15 refractor.
The optical tube assembly weighs about 500 kg and the overall weight, including the mount, is 2500 kg.
At this point, the tube assembly (also called the "tube head") is removed from the X-ray system, and replaced with a new tube assembly.
The old tube assembly is shipped to a company that reloads it with a new X-ray tube.