AN APPARATUS FOR EVALUATING AT LEAST ONE RECORDING ON A ROTARY DIAGRAM CARRIER WHICH HAS A STARTING MARK AND IS SENSED BY SCANNING MEANS DISTINGUISHING DIFFERENT SECTIONS OF THE RECORDING, AND PRODUCING A START SIGNAL WHEN SENSING THE START MARK. A PULSE GENERATOR GENERATES TIME PULSES WHICH ARE COUNTED BY A TIME COUNTER PRODUCING AN END SIGNAL WHEN A PREDETERMINED NUMBER OF TIME PULSES, CORRESPONDING TO 24, OR 12 HOURS, FOR EXAMPLE, IS COUNTED. WHILE SENSING THE DIFFERENT SECTIONS OF THE RECORDING, THE SCANNING MEANS TRANSMIT DIFFERENT SIGNALS REPRESENTING THE RESPECTIVE SECTIONS OF THE RECORDING, TO DISTRIBUTING GATES WHICH PERMIT THE PASSAGE OF CORRESPONDING NUMBERS OF TIME PULSES TO DIFFERENT STORAGE COUNTERS WHICH ARE SEPARATELY READ OUT WHEN THE END SIGNAL IS PRODUCED AFTER 24, OR 12 HOURS, FOR EXAMPLE.