## The Measured Time Intervals Between the Appearance of Certain Spectrum Lines of Helium and of Mercury |

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Abraham and Lemoine accurately crossed actual time intervals apparatus appearance arc lines arc spectrum atomic system Balmer series Beams loc Bohr Brackett series capable of emitting carriage COLOR WAVE LENGTH definite frequencies discharge double refraction electric field energy excitation experimental procedure gap G green helium and mercury INTERVALS IN SECONDS inverse square law Kerr cell LENGTH NOTATION REMARKS LENGTH TIME INTERVALS light path light shutter line spectra lines of finite Lyman line Lyman series mirror system notation not established nucleus orbit Orthohelium doublet orthohelium lines oscillations parhelium and orthohelium parhelium line Paschen series plane polarized plates possible production of spectra return beam Rutherford atom second line second Nicol SEQUENCE COLOR WAVE Series notation shutter effect slider spark gap spark lines spark series spectra of helium spectrograph spectrum lines spectrum of hydrogen static machine temperature thru trolley vacuum tube vibrations violet WAVE LENGTH NOTATION WWWW yellow Zeeman effect