1. A TIME RECORDER AND COMPARATOR FOR WELL DRILLING OPERATIONS COMPRISING A SINGLE RECORDING UNIT INCLUDING THREE SEPARATE COUNTERS, A FIRST ONE OF SAID COUNTERS HAVING A FIRST INPUT SHAFT FOR OPERATING SAID FIRST COUNTER SO AS TO INDICATE THE TOTAL ELAPSED TIME DURING WHICH ACTUAL DRILLING HAS TAKEN PLACE, A SECOND ONE OF SAID COUNTERS HAVING A SECOND INPUT SHAFT FOR OPERATING SAID SECOND COUNTER SO AS TO INDICATE THE TOTAL ELAPSED TIME DURING WHICH THE DRILLING OPERATIONS WERE INTERRUPTED, THE THIRD ONE OF SAID COUNTERS HAVING A THIRD INPUT SHAFT FOR OPERATING SAID THIRD COUNTER SO AS TO INDICATE THE TOTAL DEPTH OF DRILLING, A CONSTANT SPEED DEVICE MOUNTED WITHIN SAID UNIT AND HAVING AN OUTPUT SHAFT ROTATING AT A CONSTANT RATE OF SPEED, A FIRST CLUTCH PLATE FREELY ROTATABLY MOUNTED ON SAID OUTPUT SHAFT AND BEING RELATIVELY AXIALLY IMMOVABLE WITH RESPECT THERETO, A SECOND CLUTCH PLATE FREELY ROTATABLY MOUNTED ON SAID OUTPUT SHAFT IN SPACED RELATION WITH SAID FIRST CLUTCH PLATE, SAID SECOND CLUTCH PLATE BEING RELATIVELY AXIALLY IMMOVABLE WITH RESPECT TO SAID OUTPUT SHAFT, MEANS DRIVINGLY CONNECTING SAID FIRST COUNTER INPUT SHAFT WITH SAID FIRST CLUTCH PLATE WHEREBY ROTATION OF SAID FIRST CLUTCH PLATE WILL ADVANCE SAID FIRST COUNTER, MEANS