. The Bell System technical journal . spsm and Vsm of that minimum decrease with increasing v. Therewould be wide gaps in the range of frequency over which these state-ments had been tested, but nothing would suggest that there might bediscrepancies within the gaps. However, the situation is not sosimple. Mention must be made of remarkable and perplexing dataobtained by C. and H. Gutton and collaborators of theirs, mainly withexternal-electrode tubes. Fig. 17, relating to hydrogen, is taken from some of H. Guttons CONTEMPORARY ADVANCES IN PHYSICS 105 most recent work: it is a set of Fs-vs-p cu
. The Bell System technical journal . spsm and Vsm of that minimum decrease with increasing v. Therewould be wide gaps in the range of frequency over which these state-ments had been tested, but nothing would suggest that there might bediscrepancies within the gaps. However, the situation is not sosimple. Mention must be made of remarkable and perplexing dataobtained by C. and H. Gutton and collaborators of theirs, mainly withexternal-electrode tubes. Fig. 17, relating to hydrogen, is taken from some of H. Guttons CONTEMPORARY ADVANCES IN PHYSICS 105 most recent work: it is a set of Fs-vs-p curves for various frequenciesof an extremely wide range (the wave-lengths in meters are markedbeside the curves) obtained with a tube 10 cm. long closed at its endsby flat plates, covered outwardly by sheets of tinfoil serving as theelectrodes. (Gutton never indicates the actual observations on hisgraphs.) It is superfluous to say that this family of curves is easyneither to envisage nor to describe. Most of them are of the type 500 r. LOG ^ Fig. IS^Onset-potential vs. (logarithm of) wave-length, for self-sustaining glow atthe indicated pressures. (H. Gutton.) familiar from other researches, with a single flattish minimum; butsome are very different, with no minimum at all in the range of experi-ment, but a couple of sharp bends with a linear segment Vs-vs-v curves for various pressures, exhibited in Fig. 18, form aset even more confusing. Over the frequency-ranges where the curves of Fig. 17 have single 106 BELL SYSTEM TECHNICAL JOURNAL minima, where accordingly we may define Vsm and psm as before,these do not always vary in the same sense with v. hs, the frequencyis raised from about 4-10^ Vsm increases at first; then come the curveswith curious shapes; when again the fiattish minima return, at 4-108cycles or thereabouts, Vsm is following the hitherto-familiar rule ofdecreasing with increase of frequency; but further along, beyondabout 3 • 10^ the trend again rev
Size: 1360px × 1837px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
