## Counting rate meter based on a design by M.I.T. |

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60 cycles 6AC7 Integrator tube according to Poisson's adjust Amplifier and Pulse Assuming a radioactive beta particle CALIBRATING INSTRUCTIONS cathode central wire chassis Circuit Quoting constant Counting Rate Meter counting rate range Counts per Minute Decaying Source Ester line-Angus Expected Charge Fractional Standard frequency cpm full-scale G-M tube grid instrument Integrating Circuit MDDC meter reading meter will read mica milliampere multiple and sub-multiple multivibrator Neher-Pickering circuit Neher-Pickering Quenching Circuit number of stationary ohm shunt oscilloscope periodic pulses phone plug pin jack Plate Voltage Power polystyrene filled condensers potentiometer Pulse Equalizer Pulse Generator Frequency randomly distributed pulses reach a reading read 225 counts recorder Regulated High Voltage Regulated Plate Voltage Schiff and Evans screen poten second red mark seconds for range selector switch sine wave cycles single reading six minutes standard deviation sub-multiple frequencies switch on range t)/RC dt tank circuit Tube Voltmeter Circuit Vacuum Tube Voltmeter Voltage Power Supply