One workhorse of the ETA mechanical line is the ETA 2824-2, The 2824 is an automatic winding, twenty-five jewel movement, available in four executions or grades: Standard, Elaborated (improved), Top and Chronometer.
The Breather Valve is a protection device mounted on a nozzle opening on the top of a fixed roof atmospheric storage tank. Its primary purpose is to protect the tank against rupturing or imploding.
Boost is the term that people use to describe the air pressure in the inlet manifold. This pressure is essentially the force feeding of air into the engine. An internal combustion engine is an air pump with a little fuel thrown in. In order to burn fuel and make power, air has to be present.