Anyone seen these before? http://www.ebay.com/itm/NOS-USAF-WWII-KOREA-AIRFORCE-PLANE-ALTITUDE-DISTANCE-FINDER-MULTI-MOTOR-JET-/251318987955?pt=LH_DefaultDomain_0&hash=item3a83c76cb3
How was it used to track an aircraft as it is vague on the drawing in a way?
By: Daniel - 16th August 2013 at 17:32
By: D1566 - 16th August 2013 at 15:38
At a guess, if the wingspan filled a particular circle, that would give an approximate height/distance.
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August 16, 2013 at 3:21 pm