Course and Speed Calculator Mk II Ref 6B/119 RAF 1939 F-14 dated 1940

dated 1940

the pitot tube was employed by pitot-statically-driven instruments to perform their function

system installation in a B-29 began early in June

it was used as a high power jamming transmitter of sufficient power to screen a large bomber within two miles of enemy radar systems operating within its frequency band of 350-800 mc

Course and Speed Calculator Mk II Ref 6B/119 RAF 1939 F-14 dated 1940This is an original WWII era Course and Speed Calculator Mk II as used by aviators of the British RAF in its wooden case. The case is marked as having been made for a different serial number, but the correct serial number has been painted on the outer end. The case measures ~ 11 in x 6 in x 2 in. It is in good condition given its age as the center rotates and slides along the base when the locking clamp is released.