Electron tubes are used to manipulate electronic or electrical signals. They can be employed to convert AC to DC, amplify, attenuate, switch, mix, or generate audio or radio signals. Tubes have been mostly replaced by solid-state devices such as the transistor, but still have some applications in modern electronics.
military, industry,agriculture,etc the summary .our modern existance
A 'toothed wheel' is referring to a gear. Sets of gears can be used for many purposes, but they serve to change the direction of motion or to change the rate of rotation for speed purposes.
Heat exchangers are not indentical to furnaces. However, they do serve a similar purpose. Both heat exchangers and furnaces serve important individual purposes. They also aee ulilitzed for different devices.
It used 5200 vacuum tubes.
As most plastics used in specimen tubes will melt if sterilized with heat the plastic tubes are normally single use
Decoder tubes for color or black and white images
Johannes Haantjes has written: 'Classification of electron tubes' -- subject(s): Electron tubes
E. Charles Alvarez has written: 'Introduction to electron devices' -- subject(s): Electron tubes, Semiconductors 'Introduction to electron tubes and semiconductors'
The two most recognizable types of electron tubes are vacuum tubes and cathode ray tubes. Vacuum tubes are electronic devices that control electrical signals, while cathode ray tubes are used in older television and computer monitors to display images.
feeding purposes
energy and structure
for warmth
What are the barrier islands and what purposes do they serve?
electron
I presume you mean Bronchi which are tubes going to the lungs and serve as tubes to carry air in and out of the lungs on breathing
No, oxygen is the final electron acceptor of the electron transport chain.
Thermionic emission is commonly used in devices such as vacuum tubes and cathode ray tubes to generate and control electron beams. It is also used in some types of electron microscopes, x-ray tubes, and microwave tubes. Additionally, it is utilized in some types of detectors and ionization gauges.