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7th Dec 2019, 8:19 pm | #1 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
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1920s/1930s visual "Arrow" beacon system.
Not sure if this is really appropriate for the forum [mods feel free to delete if you see fit] but I found this:
https://sometimes-interesting.com/20...beacon-system/ which was a late-1920s/early-1930s visual version of the radio-beacon network, used for the US Mail planes. Some of the hilltop visual-beacon sites in turn became locations for radio-navigation beacons, and for HF voice/CW aircraft radio installations. |