.~> Periodically moving light interrupting element {1}
DEFINITION
Classification: 356/23
(under the class definition) Subject matter comprising means whereby the relationship between periodic changes in light intensity or direction and the motion of a body are utilized in observing the body or performing some measurement with regard to the body or some means controlling the light source.
(1) Note. Where a specific test is provided for in another class, classification is in that class even though the subject matter may include a stroboscope. See Search Class notes below.
SEE OR SEARCH CLASS
73, Measuring and Testing,
1.56, for timing apparatus for watches, camera shutters and the like which may utilize stroboscopic principles.
315, Electric Lamp and Discharge Devices: Systems, appropriate subclasses for electric lamp and discharge device systems in general.
324, Electricity: Measuring and Testing, 75, for calibration of electric meters using stroboscopic principles, and subclasses 76.11+ for measuring electric properties using stroboscopes.
