Photo-electric pickoff and resolver for gyroscopes

Claim 1

A VERTICAL GYROSCOPE SUPPORTED UPON AT LEAST A PAIR OF AXES WHICH ARE NORMAL TO THE VERTICAL REFERENCE AXIS OF SAID GYROSCOPE AND NORMAL TO EACH OTHER AND WHICH FORM WITH THE VERTICAL AXIS A FIRST COORDINATE SYSTEM; A PENDULUM SUPPORTED RELATIVE TO A SECOND COORDINATE SYSTEM WHICH HAS ONE AXIS COAXIAL WITH SAID VERTICAL AXIS OF SAID FIRST COORDINATE SYSTEM; ILLUMINATION MEANS POSITIONED UPON SAID PENDULUM AND HAVING AN ILLUMINATION PATTERN SYMMETRICAL WITH THE AXIS OF SAID PENDULUM; A FIRST PAIR OF IN-LINE PHOTO-ELECTRIC DEVICES MOUNTED UPON SAID VERTICAL GYROSCOPE, POSITIONED SYMMETRICALLY WITH RESPECT TO SAID VERTICAL AXIS AND ORIENTED TO DETECT MOTION OF SAID ILLUMINATION SOURCE RELATIVE TO SAID VERTICAL GYROSCOPE ALONG SAID DEVICES; A SECOND PAIR OF IN-LINE PHOTOELECTRIC DEVICES MOUNTED UPON SAID GYROSCOPE, POSITIONED WITH THEIR IN-LINE DIRECTION NORMAL TO SAID FIRST PAIR OF PHOTO-ELECTRIC DEVICES AND SYMMETRICALLY WITH RESPECT TO SAID VERTICAL AXIS AND ORIENTED TO DETECT MOTION OF SAID ILLUMINATION SOURCE ALONG SAID SECOND PAIR OF DEVICES; SAID ILLUMINATION SOURCE HAVING A UNIFORM ILLUMINATION PATTERN ABOUT ITS AXIS TO CAUSE EACH OF SAID PHOTO-ELECTRIC DEVICES TO BE EQUALLY ILLUMINATED WHEN THE AXIS OF SAID PENDULUM IS IN A PREDETERMINED NO-SIGNAL POSITION COAXIAL WITH SAID VERTICAL AXIS.