In my previous post I talked about some Japanese ARP posters from 1938. One in particular (above; click for larger version) is very revealing: it shows exactly whose bombers the Japanese were worried about, by plotting circles on a map of Japan and its neighbours, representing the radius of action
This sort of map is quite common these days, particularly in highlighting the danger from rogue states. For example, here's one centred on North Korea, from a website criticising Clinton's foreign policy:
The circles here are not the radii of action of bombers, of course, but the ranges of missiles.
Here's another missile-era map, this time quite an historic one from the Cuban missile crisis in 1962 (looks like it was drawn up by the CIA). This is more like the Japanese map: though the threat is from Cuba, the centre of the map is shifted towards the United States, to show just how much of the country would fall under the shadow of Soviet missiles (but by the same token, de-emphasising the threat to South America).
I haven't come across many other pre-Second World War examples, though I'm sure they exist. The only other one I currently know of is British, and is very early, dating from 1913:
This time it's not bombers or missiles that are the threat, but Zeppelins. (Love that OTT title!) The map is centred on Heligoland, which another map in the same magazine claimed was the site of an airship station. The caption says that the outer circle (600 miles) represents the radius for Zeppelins; the 300 mile circle is for aeroplanes. It 'should bring home to every patriot the vital necessity of Britain putting her house in order forthwith, by the grant of adequate provision in the nation's Estimates to enable us to make up the heavy leeway from which this country already suffers'. Indeed it should; those circles are very dark, aren't they? Though that might just be the poor quality of my photocopy ...
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