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90 volts active centers present affecting initial luminosities alpha particle bombard apparent candle-power BaBr2 brightness bromide and barium c.p. radium bromide cent RaBr2 cooled suddenly curve for tube decay of luminosity decrease in luminosity definite equilibrium equilibrium luminosity equilibrium value Experiments on Equilibrium Factors affecting initial furnace given temperature hand scale heated to 600 higher temperature hour after removal increases Initial temperature 600 investigation Kabakjian large number liquid air lower radium content luminosity at 20 luminosity decay curves luminosity measured luminosity occurred luminosity of pure luminosity of tube luminous compounds Maximum luminosity mixtures of radium number of active observation 20 operated at 90 osity photometer prisms pure RaBr2 pure radium bromide radium tube rapid cooling rate of decay rate of luminosity reference lamp room temperature Rutherford subsequent heating suddenly to 20 temperature of observation time-luminosity curves transmission coefficient tube is dependent Tube luminosities tube was heated unstable configurations zinc sulfide