Recorder for densitometer

Claim 1

IN AN AUTOMATIC RECORDING APPARATUS FOR ELECTRICAL SIGNALS, IN COMBINATION, INPUT MEANS FOR SUPPLYING AN ELECTRICAL INPUT SIGNAL TO BE RECORDED; RECORDING MEANS HAVING A SUBSTANTIALLY LINEAR POTENTIOMETER MEMBER AND A MOVABLE RECORDING MEMBER; CIRCUIT MEANS INTERCONNECTING SAID INPUT MEANS WITH SAID RECORDING MEANS FOR RECORDING VARIATIONS IN SAID INPUT SIGNAL BY SAID MOVABLE RECORDING MEMBER; ADJUSTABLE RESPONSE-VARYING MEANS HAVING A SUBSTANTIALLY LINEAR VARIABLE IMPEDANCE MEMBER MECHANICALLY COUPLED FOR SUBSTANTIALLY PROPORTIONATE MOVEMENT WITH SAID POTENTIOMETER MEMBER AND ELECTRICALLY SO CONNECTED TO SAID POTENTIOMETER MEMBER AS TO BE ADAPTED TO VARY THE RESPONSE OF THE RECORDING MEANS TO SAID INPUT SIGNAL IN SUCH A MANNER THAT THE MOVEMENTS OF SAID MOVABLE RECORDING MEMBER DEPEND ON SAID INPUT SIGNAL IN ACCORDANCE WITH A QUASI-LOGARITHMIC FUNCTION; AND ADJUSTING MEANS ELECTRICALLY CONNECTED TO SAID RESPONSE-VARYING MEANS FOR ADJUSTING THE SAME SO THAT THE MOVEMENTS OF SAID RECORDING MEMBER DEPEND ON SAID INPUT SIGNAL IN ACCORDANCE WITH DIFFERENT QUASI-LOGARITHMIC FUNCTIONS.