| 摘要 |
A gyrocompass with a tilt ring pivotable about a substantially horizontal axis has a U-frame swingable about that axis which forms part of a pendular system and carries a coupling lever engageable with projections on the lower end of the U-frame to immobilize the latter with respect to the tilt ring when the instrument is inactive, in order to hold a gyroscope axis perpendicular to the tilt-ring axis in a horizontal position. An antipendular system, comprising a liquid-filled U-tube swingable about the gyroscope axis, is overridden by the pendular system in the engaged position of the coupling lever but becomes effective upon disengagement thereof to let the gyroscope mechanism carry out necessary precession movements. |
