City of Angels is a film that was directed by Brad Silberling[?] in 1998. The film is a recasting of the story in Wim Wenders' film Wings of Desire, but moved to Los Angeles, California. In the film, an angel falls in love with a human and has to decide whether to become mortal to spend human life with her.
... finds the "rolling" point, but the gyro will also be accelerated to a smaller extent by the slipping friction.
The device is covered by US patents 3,726,146 (1973) ...