9. FIELD ARTILLERY SOUND RECORDER
Until the development of radar, sound ranging was one the most effective ways to locate enemy artillery, mortars and rockets. The process was first developed in World War I, and then continued being used through the Korean War.
From a forward operating post, a field artillery sound recorder would monitor an oscillograph and recorder connected to several microphones. When the sound of an enemy gun would reach a microphone, the information would be recorded on sound film and the data from several microphones could be analyzed to locate an enemy gun.
The technology is still in use today by many countries, which often use sound ranging in concert with radar.
10. AIRPLANE WOODWORKER
Although wood was largely phased out and replace by tubular steel in airplane construction by the time World War II started, there was still a need for airplane woodworkers to repair and maintain existing aircraft-- especially gliders and some training aircraft.
Wooden gliders like the Waco CG-41-- the most widely used American troop/cargo glider of the war-- played critical parts in the action. The CG-4A was first used in the invasion of Sicily in July 1943. They most commonly flew airborne troops into battle, most famously on the D-Day assault on France on June 6, 1944 and in Operation Market Garden in September 1944.
They were also used in the China-Burma-India Theater.
--GreGen
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