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100K potentiometer amplifier analog computer application of sampled-data approximately automatic valve Bristol recorder calibration capacitors cathode follower Chem computer diagram control theory digital compensation calculated Digital Computers digital-to-analog transducer drift error function experimental runs factor Figures 12 gallons per minute hand valve hysteresis inches input was applied intersample ripple Laplace Laplace transform manual control microswitch multiple capacity systems ohms optimum order hold circuits order lag units output flow rate pneumatic signal Prog pulse transfer function Ragazzini ramp input ramp set point required digital compensation resistors rotameter sampled-data control system sampled-data system sampling instants sampling period seconds time constant shown in Figure single capacity system small time constants steady state error step in load step input weir step load input strain gage Sutro weir system response Taylor transducer three weir tanks Trans vacuum tube vacuum tube voltmeter voltage voltmeter volts z-transform zero error zero order hold zero steady