DRIFT METER TYPE B-5 U.S. ARMY AIR FORCE SPECIFICATION NO. 27402

Description

THIS DRIFT METER IS IN EXCILENT CONDITION.
Drift meters were extensively used in World War II by bomber aircraft. Typically, fighter aircraft were not equipped with this kind of relatively sophisticated navigational equipment. For instance, in the Pacific Theater, where navigation was difficult due to scarcity of land or other prominent features, fighters were often guided by bombers that had a dedicated navigator and navigational equipment.[1] Some drift meters were purely optical (e.g., USAAF Type B-5 drift meter), while others included electrically powered gyroscope (e.g., USAAF Type B-3 drift meter).[2] USAAF Type B-5 drift meter was also equipped with a simple flight computer (a rotating wheel) to calculate the ground speed from the measured time that takes for a ground object to pass from the top to the bottom of the reticle. INFORMATION CREDITED TO https://en.wikipedia.org/wiki/Drift_meter
DRIFT METER TYPE B-5 U.S. ARMY AIR FORCE SPECIFICATION NO. 27402
THIS DRIFT METER IS IN EXCILENT CONDITION.
Drift meters were extensively used in World War II by bomber aircraft. Typically, fighter aircraft were not equipped with this kind of relatively sophisticated navigational equipment. For instance, in the Pacific Theater, where navigation was difficult due to scarcity of land or other prominent features, fighters were often guided by bombers that had a dedicated navigator and navigational equipment.[1] Some drift meters were purely optical (e.g., USAAF Type B-5 drift meter), while others included electrically powered gyroscope (e.g., USAAF Type B-3 drift meter).[2] USAAF Type B-5 drift meter was also equipped with a simple flight computer (a rotating wheel) to calculate the ground speed from the measured time that takes for a ground object to pass from the top to the bottom of the reticle. INFORMATION CREDITED TO https://en.wikipedia.org/wiki/Drift_meter
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