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35 volts admitted Anode to cathode arc current arc discharge tube arc voltage Bazzoni and Lay2 bridge grid resistor brighter line bulb calibrating lamp cathode and grid cathode voltage Fig center tapped color analyzer constant intensity current densities current returned desired line electric cell equipotential cathode filament structure galvanometer deflection given operating point grid structures helium line hemispheres increasing voltage Intensity variation intensity was determined ionization potential JOSEPH RAZEK lamp current lamp oper light intensity light output LINES WITH VOLTAGE low voltage arc milliammeter milliamperes mirror Mulder and Razek nearly constant negligible optical arrangement photoelectric cell photoelectric spectrophotometer Phys PHYSICAL REVIEW plate structure potential divider Razek and Mulder rheostats show a region shown in Fig shutter in front slit spectrometer spectroscope spectrum lines Spectrum Tube sphere standard lamp striking voltage temperature UNIVERSITY OF PENNSYLVANIA vacuum tube amplifier vacuum tube voltmeter variation with arc voltage arc discharge wave-length Wiring diagram