1) Vacuum pump
Found on
https://www.crosswordclues.com/clue/diffusion-pump
Diffusion pumps use a high speed jet of vapor to direct gas molecules in the pump throat down into the bottom of the pump and out the exhaust. Invented in 1915 by Wolfgang Gaede using mercury vapor, and improved by Irving Langmuir and W. Crawford, they were the first type of high vacuum pumps operating in the regime of free molecular flow, where t...
Found on
http://en.wikipedia.org/wiki/Diffusion_pump
No exact match found.
