By Hicbd
Tue Feb 28 2023 12:14 pm
"This is a radioluminescent escape and evasion button compass used by the Royal Air Force (RAF) during World War II—it was a clever enough idea that compass buttons are still produced today!...The bottom button has a tiny needle in the middle that projects upwards. When balanced on the needle, the top button rotates in the earth's magnetic field until the two radioluminescent dots (the upper right corner in the photo above right) indicate north. The single dot points south."
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