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intrigued by the idea that, properly configured, it might be possible to use a flame or something similar to detect radio signals. after determining that an open flame was too susceptible to ambient air currents, de forest investigated whether ionized gases, heated and enclosed in a partially evacuated glass
tube, could be used instead. in to he developed various configurations of glass-tube devices, which he gave the general name of "audions". the first audions had only two electrodes , and on october , , [ ] de forest filed a patent for diode vacuum tube detector , that was granted u.s. patent number...
https://en.wikipedia.org/wiki/Lee_de_Forest
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