US PATENT SUBCLASS 33 / 391
.~.~ Pendulum

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

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
365  DF  .~ Level or plumb, terrestrial gravitation responsive {9}
391.~.~ Pendulum {8}
392  DF  .~.~.~> Plumb line (i.e., flexible, line suspended plumb bob) {1}
395  DF  .~.~.~> Plural, coacting in intersecting planes
396  DF  .~.~.~> Liquid buoyed
397  DF  .~.~.~> Gimbal mounted
398  DF  .~.~.~> Weight, variable quantity or center of gravity
399  DF  .~.~.~> Indicium adjustably fixed to reference-surface section or to weight {1}
401  DF  .~.~.~> Motion transmitting mechanism drives indicator (e.g., gearing, magnetic coupling)
402  DF  .~.~.~> Means limiting swing

DEFINITION

Classification: 33/391

(under subclass 365) Device wherein the responsive portion is a body, so supported as to be free to swing to a position wherein (1) its center of gravity, or (2) its center of buoyancy, is utilized to determine the vertical.

SEE OR SEARCH THIS CLASS, SUBCLASS:

308+, for a pendulum controlled indicator of borehole inclination.

366.24, for this subject matter controlling an electrical level indicator.