US PATENT SUBCLASS 33 / 324
.~.~ Gyroscopic compass

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
318  DF  .~ Gyroscopically controlled or stabilized {5}
324.~.~ Gyroscopic compass {3}
325  DF  .~.~.~> Transmission system for remote readout
326  DF  .~.~.~> Selective correction for deviation
327  DF  .~.~.~> Fluid, suspension or control

DEFINITION

Classification: 33/324

(under subclass 318) Device in which one or more gyroscopic rotors are arranged to seek a known direction relative to the meridian as by precession induced by couples applied directly as indirectly through the action of gravity.