. The Bell System technical journal . d should be without influence upon th? must beware of underestimating the influence of the anode;when an arc is formed in air between two electrodes of differentmaterials, it behaves like an arc formed between two electrodes ofthe same material as the anf)de, not the cathode! The so-called lou-iollanc arc, although not a self-niaini,lining dis-charge, merits at least a paragraph. .A dense electron-sireani pouredinto a monatomic gas from an independenth-hcaleil wirr. and ac-celerated by a surpassing the resonance-potential of liiu gas,may
. The Bell System technical journal . d should be without influence upon th? must beware of underestimating the influence of the anode;when an arc is formed in air between two electrodes of differentmaterials, it behaves like an arc formed between two electrodes ofthe same material as the anf)de, not the cathode! The so-called lou-iollanc arc, although not a self-niaini,lining dis-charge, merits at least a paragraph. .A dense electron-sireani pouredinto a monatomic gas from an independenth-hcaleil wirr. and ac-celerated by a surpassing the resonance-potential of liiu gas,may ionize it so intenseh- that there is a sudden transformation intoa luminous arc-like discharge. This is a sort of assisted arc, itscatlxKle being ke|)t warm for its benefit by outside agencies. Itshistory is .i long and interesting chapter of contemporary physics,whereof the end i> not \et. The most remarkable feature of this arc n ^m mwmtmmmmmmmmmmm* -^ »«««M4tf MM Mlll»> «r^ •• ^ r<iWir<it«wnnRrrc*«^. Fig. — Photographs of the glow-dischnrge in a long narrow rvlintlcr. showing chiclly the sulHJivision of the positive column into striations. (De la Rue and Muller, Philosophical Transactions of the Royal Socifly) 142 BELL SYSTEM JOURNAL is that it can siir\ ive even if tlie voltage between anode and cathodeis far below the resonance-potential of the atoms of the gas, whichseems impossible. A year ago it seemed that this effect could alwaysbe ascribed to high-voltage high-frequency oscillations generated inthe arc. This explanation was presently confirmed in some cases anddisfjualificd in others, and now it appears that when there are nooscillations an astonishingly strong de\elopswithin the ionized gas. Potential-maximum and oscillations alikeare pr(»l)ably to be regarded as manifestations of space-charge. The Glow in a rarefied ^as is a magnificent sight when the gas israrefied to the proper degree, not too little
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
