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Updated: October 15, 2026
"This thing registers some kind of wireless rays infra-red, I think, something like those that they say that Italian scientist, Ulivi, claims he has discovered and called the 'F-rays." "How do you know?" I asked, looking up from my work. "What's that instrument you are using?" "A bolometer, invented by the late Professor Langley," he replied, his attention riveted on it.