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The earliest hot tubs were calderas in which hot stones were placed to heat the water. [citation needed] Therma in Ikaria has been a very popular place particularly for hydrotherapy ever since the 4th century B.C. [2] The remains of wrecked marble bathtubs along with a prehistoric aqueduct that have been unearthed from this area bear ample testimony of the place's popularity in the ancient times.
The control grid is an electrode used in amplifying thermionic valves (vacuum tubes) such as the triode, tetrode and pentode, used to control the flow of electrons from the cathode to the anode (plate) electrode. The control grid usually consists of a cylindrical screen or helix of fine wire surrounding the cathode, and is surrounded in turn by ...