.~ With scale or optical grid displaced relative to remote fiducial mark
DEFINITION
Classification: 356/396
With scale or optical grid displaced relative to remote fiducial mark:
(under subclass 388) Subject matter wherein a scale or optical grid is displaced relative to a remote reference point.
(1) Note. The reference point could be for example, a mark on the reticle of an eye piece or a photocell.
SEE OR SEARCH THIS CLASS, SUBCLASS:
150+, or similar subject matter used in measuring angles.
SEE OR SEARCH CLASS
250, Radiant Energy,
216+, for miscellaneous photocell circuits. 359, Optics: Systems (Including Communication) and Elements,
436+, where the fiducial mark is immediately adjacent to the scale and an optical element such as a mirror or lens is used to facilitate reading the scale.
