Analog-to-digital conversion system

Claim 1

IN COMBINATION WITH AN ANALOG OUTPUT SHAFT REPRESENTATIVE OF A FULL SCALE OF ANALOG COUNTS FOR 360 DEGREES OF ROTATION AND A SHAFT-TO-DIGITAL CONVERTER INCLUDING AN INPUT SHAFT CONNECTED TO A CONVERTER DISC HAVING A FULL SCALE DIGITAL COUNT OUTPUT FOR 360 DEGREES OF DISC ROTATION, RESOLUTION DOUBLING MEANS COMPRISING 1:2 SPEED RATIO COUPLING MEANS CONNECTING SAID ANALOG SHAFT TO THE INPUT SHAFT OF SAID CONVERTER, SAID CONVERTER DISC THEREBY ROTATING AT TWICE THE SPEED OF SAID ANALOG SHAFT AND PRODUCING A FULL SCALE SET OF DECIMAL COUNTS FOR EACH HALF REVOLUTION OF SAID ANALOG SHAFT, SWITCH MEANS COUPLED TO SAID ANALOG SHAFT AND IN CLOSED CONDITION DURING ONE HALF REVOLUTION AND IN OPEN CONDITION DURING THE OTHER HALF REVOLUTION OF ANALOG SHAFT ROTATION TO THEREBY INDICATE WHICH HALF REVOLUTION THE ANALOG SHAFT IS IN FOR GIVEN DECIMAL COUNTS OF SAID DISC, AND STOP MEANS ASSOCIATED WITH SAID ANALOG SHAFT TO LIMIT ROTATION THEREOF TO LESS THAN ONE REVOLUTION AND REDUCE THE SCALE OF ANALOG COUNTS THEREOF BY AN AMOUNT CORRESPONDING TO THE AMBIGUITY INTERVAL OF SAID SWITCH MEANS IN TRANSFERRING BETWEEN CLOSED AND OPEN CONDITIONS.