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A comment on Show HN: I built a desktop radiation monitor with Raspberry Pi, brass and wood. Parent comment

Re:Show HN: I built a desktop radiation monitor with Raspber... by trhway on Tuesday July 07, 2020 @04:57PM (#23763983)
>By 1880, Langley's bolometer was refined enough to detect thermal radiation from a cow a quarter of a mile away.

Sidenote: that sounds like even F-22/35 should be visible half a globe away in IR

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Re:Show HN: I built a desktop radiation monitor with Raspber... by schoen on Tuesday July 07, 2020 @07:08PM (#23765265)
Be careful of that inverse square law—it's a doozy!
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