Barry

Claim 1

A COURSE CORRECTOR COMPRISING A RELATIVELY THIN FLAT OUTER DIAL RING, AN INTERMEDIATE DIAL RING CONCENTRIC WITH THE OUTER DIAL RING AND ROTATABLY FITTED TO THE INNER DIAMETER OF THE OUTER DIAL RING, AND INNER DIAL RING HAVING A CENTRAL OPENING THERETHROUGH, CONCENTRIC WITH THE OUTER DIAL RING, AND ROTATABLY FITTED TO THE INNER DIAMETER OF THE INTERMEDIATE DIAL RING, AN ANGULARLY POSITIONED CONTROL TAB FIXEDLY ATTACHED TO THE INNER DIAL RING, EACH OF SAID DIAL RING HAVING ANGLE GRADUATIONS RANGING FROM 0 TO 360 DEGREES REPRODUCED THEREON, A FLAT BASE DISC ATTACHED TO THE OUTER DIAL RING ADAPTED TO ROTATABLY SUPPORT THE INTERMEDIATE AND INNER DIAL RINGS, A CENTRAL DISC CONCENTRIC WITH THE INNER DIAL RING, MEANS FIXEDLY ATTACHING THE INTERMEDIATE DIAL RING TO THE CENTRAL DISC, THE CENTRAL DISC BEING ROTATABLY SUPPORTED BY THE BASE DISC ATTACHED TO THE OUTER DIAL RING, A PAIR OF STOPS ADAPTED TO LIMIT THE ROTATIONAL ANGULAR MOVEMENT OF THE INTERMEDIATE DIAL RING, THROUGH A LIMIT ANGULAR RANGE IN BOTH DIRECTIONS, RELATIVE TO THE ZERO ANGULAR DESIGNATION ON THE OUTER DIAL RING, A SECOND PAIR OF RADIALLY POSITIONED STOPS ADAPTED TO LIMIT THE ROTATIONAL ANGULAR MOVEMENT OF THE INNER DIAL RING, THROUGH A LIMITED ANGULAR RANGE, RELATIVE TO THE ZERO ANGULAR MARKER ON THE INTERMEDIATE DIAL RING IN BOTH DIRECTIONS, MEANS VISIBLE ON SAID CENTRAL DISC, ADAPTED TO INDICATE THE ROTATIONAL ANGULAR MOVEMENT OF THE INTERMEDIATE DIAL RING, FROM THE ZERO ANGULAR MARKER ON THE OUTER DIAL RING, IN BOTH DIRECTIONS, WITHIN THE ANGULAR RANGE ESTABLISHED BY THE STOPS LIMITING THE MOVEMENT OF THE INTERMEDIATE DIAL RING, AND MEANS VISIBLE ON SAID CENTRAL DISC ADAPTED TO INDICATE THE ROTATIONAL ANGULAR MOVEMENT OF THE INNER DIAL RING FROM THE ZERO ANGULAR MARKER ON THE INTERMEDIATE DIAL RING, IN BOTH DIRECTIONS, WITHIN THE ANGULAR RANGE OF THE STOPS LIMITING THE MOVEMENT OF THE INNER DIAL RING, THE SUPPORT MEANS ATTACHED TO THE OUTER DIAL RING BEING A THIN SUBSTANTIALLY CIRCULAR DISC, THE OUTER DIAMETER OF THE SUPPORT DISC BEING SUBSTANTIALLY EQUAL TO THE OUTER DIAMETER OF THE OUTER DIAL RING, A THIN SEPARATOR RING MOUNTED BETWEEN THE OUTER DIAL RING AND THE SUPPORT DISC, THE SEPARATOR RING EXTENDING AROUND A PORTION OF THE CIRCUMFERENCE OF THE OUTER DIAL RING, THE SEPARATOR RING BEING FIXEDLY ATTACHED TO THE OUTER DIAL RING AND THE SUPPORT DISC, THE AREA OF THE OUTER DIAL RING EXTENDING BETWEEN THE ENDS OF THE SEPARATOR RING BEING RELATIVELY FREE OF THE OUTER DIAL RING, THE MEANS FIXEDLY ATTACHING THE CENTRAL DISC TO THE INTERMEDIATE DIAL RING BEING ADAPTED TO FIT INTO THE FREE AREA BETWEEN THE SUPPORT DISC AND THE OUTER DIAL RING, TO RETAIN THE INTERMEDIATE DIAL RING IN ITS RELATION TO THE OUTER DIAL RING, SAID RETAINING MEANS BEING ADAPTED TO ENGAGE THE FIRST END OF THE SEPARATOR RING TO LIMIT THE ROTATIONAL ANGULAR MOVEMENT OF THE INTERMEDIATE DIAL RING IN ONE DIRECTION, CONTROL MEANS ATTACHED TO THE INNER DIAL RING ADAPTED TO EXTEND THROUGH THE FREE AREA BETWEEN THE SUPPORT DISC AND THE OUTER DIAL RING, TO LIMIT THE ROTATIONAL ANGULAR MOVEMENT OF THE INNER DIAL RING IN BOTH DIRECTIONS, SAID CONTROL MEANS BEING ADAPTED TO ENGAGE THE END OF THE SEPARATOR RING, OPPOSITE THE FIRST AND THEREOF, TO LIMIT THE ROTATIONAL ANGULAR MOVEMENT OF THE INNER DIAL RING IN ONE DIRECTION.