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Aim and Statement alternating current biological action potentials calibrating camera capable capacitances cathode ray oscillograph cathode ray oscilloscope cathode ray screen cathode ray tube Chapter cilloscope circuit commercially built oscilloscope D. C. amplifier DC amplifier device direct current display of biological driven sweep electrical changes electrons emission Erlanger fogging form of oscillograph frequency response gas focused tube Gasser hen anode higher frequencies horizontal amplifier insufficiently slow investigation Jour latent period light method Nitella oscilloscope described P7 phosphor panchromatic film parameters of design performance phosphorescence photograph the trace potential change potentials of phenomena power supply Puokle relatively slowly changing reproduction restricted low frequency satisfactory sensitivity sharp trace shutter slow sweep slower sweep speed string galvanometer supply system CRT thesis thyratron Torld 44 total accelerating potential trace brilliance transient occurs tube sweep Univ vacuum tube amplifiers velocities vertical amplifier Vertical Deflection Amplifier visual observation volts in reference writing speed