A tube in which an electron beam is directed across a fluorescent tube so it will generate images.

The cathode-ray tubes are used in oscilloscopes, radar, television sets, and computer monitors.

A photoelectronic instrument for enhancing or sharpening faint astronomical images: An image tube is a form of electron tube in which an image is focused onto an input photocathode.

The resulting emitted electrons are accelerated within the evacuated tube by a very high voltage.

Image intensifiers are used in many instruments; such as, cameras, spectrographs, and acquisition and guidance systems.

Giant, colored worm-like creatures living around hydrothermal vents in the eastern Pacific.

They live in symbiosis with the chemosynthetic bacteria that provide the worms with their nutrition. It took the scientific specialists awhile to understand the functioning of the animal, which at first they believed to be a filter feeder.

At first they were described as having no eyes, no mouth, or any other obvious organs for ingesting food or secreting waste, and no means of locomotion. It was not a worm, a snake, nor an eel, but it wasn't a plant either.