US PATENT SUBCLASS 356 / 148
.~.~ Artificial reference

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

138  DF  ANGLE MEASURING OR ANGULAR AXIAL ALIGNMENT {11}
140  DF  .~ Apex of angle at observing or detecting station {6}
148.~.~ Artificial reference {1}
149  DF  .~.~.~> Gyroscope or pendulum stabilized optical element

DEFINITION

Classification: 356/148

(under subclass 140) Subject matter including, for the purpose of establishing a reference line or plane from which the angle can be measured, means which tends to maintain its orientation in space irrespective of changes in the orientation of the supporting structure for this means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

143, for similar subject matter where a scale and a remote point are simultaneously observable.

248+, for artificial reference determining means in general combined with optical features.

SEE OR SEARCH CLASS

33, Geometrical Instruments,

230, for a gyroscopically stabilized bomb sight, subclass 236, for a gyroscopically stabilized gun sight, subclass 273, for a sighting device having a magnetic compass and a level or plumb, subclass 283, for a vertical angle measurer including a level or plumb, subclass 290, for a sighting device with leveling means, subclass 295, for a surveyor's rod or target with leveling or plumbing means, subclasses 300+, appropriate subclasses for a level or plumb instrument and subclasses 316+ and 318+, for a gyroscopically controlled or stabilized magnetic compass.