Course and Speed Calculator Mk II Ref 6B/119 RAF 1939 F-14 in a downward direction from

in a downward direction from the transmitter antenna

likely for a large multi-engine aircraft

dated 1940

published in 1940 by the British Royal Air Force Air Ministry

Course and Speed Calculator Mk II Ref 6B/119 RAF 1939 F-14 in a downward direction fromThis 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.