(under the class definition) Subject matter including means to measure the velocity or the velocity to altitude ratio of a vehicle by sighting from the vehicle on a remote object, or including means to measure the velocity or the velocity to altitude ratio of a moving object remote from an observer by sighting on the object.
(1) Note. The vehicle may be a surface vehicle or an aircraft. The term "sighting" includes aiming an optical instrument with a photocell. This subject matter includes timing the passage of a sighted object over grids.
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350, for interferometric measurement of angular velocity.
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235, Registers,
413, for means to calculate the velocity of an object and not employing a particular sighting means.
