...The light of the sun, or any light, for that matter, wasconcentrated through the lens onto a series of photo-electric cells,composed of an alloy of selenium and the far more delicate element,illinium...
Various 「Astounding Stories, July, 1931」
...The selenium discs were flashing signals, and theradio receivers were shouting the late news; on the great power boardsdials and light signals stood out in the glow of the amylite tubes...
Various 「Astounding Stories of Super-Science, August 1930」
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coup wolff retributive
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