Zig-Zag was the codename of Eddie Chapman, a criminal imprisoned in Jersey for safe-breaking[?] in Glasgow. On the occupation of the Channel Islands, the Germans recruited him as an agent and despatched him to mainland Britain to commit acts of sabotage. He was turned and was used to feed misinformation to the Germans.
... simply fall over, but start precessing around. (The precessing motion is perpendicular to the torque trying to make the gyro fall over.)
The axis of the gyroscope in the ...