. The Bell System technical journal . these cross for B represents three values lying so close together as to Ix indistinguish-able ffrom .McLennan, Hughes, and Moltsmark) and the cross for C also threecoincident values (Kurth, Richardson and Baz^oni, HoliveckV The circle for Bis at the potential corresponding to a discontinuity in absorption, observed byHolweck. The triangle for C is a value observ-ed by Hughes, and the cross for 0 avalue from Kurth (obtained with oxidized copper). No data for for iV« are avail-able. .At .V(i measurements on the wave-length of Ka and at Mg measuremen
. The Bell System technical journal . these cross for B represents three values lying so close together as to Ix indistinguish-able ffrom .McLennan, Hughes, and Moltsmark) and the cross for C also threecoincident values (Kurth, Richardson and Baz^oni, HoliveckV The circle for Bis at the potential corresponding to a discontinuity in absorption, observed byHolweck. The triangle for C is a value observ-ed by Hughes, and the cross for 0 avalue from Kurth (obtained with oxidized copper). No data for for iV« are avail-able. .At .V(i measurements on the wave-length of Ka and at Mg measurementson the K absorption-edge commence. 296 BELL SYSTEM TECHNICAL JOURNAL lower of the continuous straight lines coming downward from the rightis the prolongation of the K line from the heavier elements downward;the upper is the prolongation of the Ka line. The fact that these inter-sect pro\es that linear extrapolation from the range of heavier atomsis unjustifiable. Re\-erting to the graph in Fig. 10, iliu pmlikMii of properly extra-. Fig. 1.^— currclaU-il witli .1/electrons. (PhilosciphkalMagazine.) polating the L and M curves is clearly not so simple as it was for theK curve; since they extend over shorter segments and do not come sofar down into the range of light elements. In Fig. 12 (from McLennanand Clark) the circles for the elements from number 3 to number 17represent observed excitation-potentials which they attribute todisplacements of /, electrons; those for the elements from number 30to number ().) represent ihe highest ami the lowest recorded emission- SOME CONTEMPORARY ADVANCES IN PHVSlCS-lll 297 frcqufiuifs of the /.-series for tliese elements, frequency being trans-lated into eciuivaienl \oltage by the same relation as above. Asfor the excitation-potentials of the heavier elements, few measure-ments on potentials of the L class have been made, and very fewindeed upon potentials of the M class—not nearly enough for anextrapolation. The
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