Interwar Bombsights
Wimpris bombsight on a DH-4. An observer uses the Wimperis bombsight, an old type. The latest sight is inside the fuselage. During WW I, the U.S. Army Air Service used the Mark I bombsight – a copy of the British Wimperis bombsight – on its DH-4s. After adjusting the sight for altitude and airspeed, the bombardier essentially aimed it like a rifle. Lacking a stabilizer, the Mark I’s accuracy suffered from movements of the airplane in flight, but it could compensate a little for wind. (U.S. Air Force photo)
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