Optical system for analyzing movement of a movable grating

Claim 1

IN AN OPTICAL ANALYZING SYSTEM, THE COMBINATION COMPRISING: A MOVABLE OPTICAL GRATING; A LIGHT SOURCE FOR ILLUMINATING SAID GRATING FROM ONE SIDE THEREOF; A SINGLE STATIONARY OPTICAL GRANTING AT THE OTHER SIDE OF SAID MOVABLE GRATING; STATIONARY OPTICAL MEANS INCLUDING ARAY DIVIDER MEANS FOR FORMING TWO CHARACTERISTICALLY DISTINGUISHABLE IMAGES OF A SINGLE POINT OF SAID MOVABLE GRATING ONTO SAID SINGLE STATIONARY GRATING, SAID TWO IMAGES BEING LATERALLY DISPLACED WITH RESPECT TO THE OPTICAL CENTER AXIS OF SAID OPTICAL MEANS IN THE DIRECTION OF IMAGE MOVEMENT AS OCCURRING UPON MOVEMENT OF SAID GRATING, WHICH DIRECTION COINCIDES, WITH THE DIRECTION OF EXTENSION OF SAID STATIONARY GRATING; TWO LIGHT RECEIVER MEANS; AND OPTICAL ANALYZING MEANS FOR INDIVIDUALLY OBSERVING SAID CHARACTERISTICALLY DISTINGUISHABLE, LATERALLY DISPLACED IMAGES ON SAID SINGLE STATIONARY GRATING AND CORRESPONDINGLY AND RESPECTIVELY ENERGIZING SAID TWO RECEIVER MEANS WITH THE LIGHT ENERGY FROM SAID TWO IMAGES.