The Music, the Technology, and the Philosophy
We learn from history that we learn nothing from history - George Bernard Shaw
The Subject of Vacuum Tubes - Starts with Thomas Edison
CLICK> The Edison Effect <CLICK
NOTE - This enlargement from the above link.
Closeup of the filament on a low pressure mercury gas discharge lamp showing white thermionic emission mix coating on the central portion of the coil. Typically made of a mixture of barium, strontium and calcium oxides, the coating is sputtered away through normal use, often eventually resulting in lamp failure. This coating recipe from 1882-83 was the basis for the evolution to what became known as the common oxide coated kathode.
CLICK> More on New Jersey and Thomas Edison <CLICK
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