ABSTRACTS 



323 



The results are plotted in Fig. 2, where it will be seen they fall 

 into two sets, the one represented by Curve No. 2 and the other by 

 Curve No. 3. 



On the basis of the interpretation given above, Curve No. 2 

 would correspond to the convergence frequencies of the L series of 

 the elements named and Curve No. 3 to the frequencies of the first 

 members of these series. 



With the object of showing how this interpretation of the ob- 

 served critical potentials fitted in with the known values of the emis- 

 sion L series wave-lengths of the heavier elements, a limited number 

 of these were selected and are given in Table III. The values given 

 are those of the longest and of the shortest known L waves of the 

 elements selected, and have been taken from Duane's Tables. The 

 square roots of the quantum voltages of these wave-lengths are 

 plotted against atomic numbers in Fig. 3, the values given in Table II 

 are also plotted in the same figure, and in order to make the record as 

 complete as possible, the square roots of additional critical voltages 

 observed by Mohler and Foote for chlorine, sulphur, phosphorus, 

 magnesium, sodium, and potassium, and by Richardson and Bazzoni 

 for molybdenum are marked on the diagram. These additional 

 critical voltages are given in Table IV. 



TABLE III 

 L Series Wave-lengths 



Element 



Zinc 



Bromine 



Rubidium. . . , 

 Strontium. . . 

 Zirconium . . . 

 Molybdenum 

 Palladium . . . 

 Cadmium. . . 



Tin 



Antimony. . . . 

 Caesium. . . . 



Cerium 



Neodymium. 

 Europium. . . . 



Erbium 



Tungsten. . . 



At. 

 No. 



30 

 35 



37 

 38 

 40 

 42 

 46 

 48 

 50 

 51 

 55 

 58 

 60 

 63 

 68 

 74 



Longest observed wave-length 



Xxio» 



12. 

 8. 

 7. 

 6. 

 6. 

 5. 

 4. 

 3. 

 3. 

 3. 

 2. 

 2. 

 2. 

 2. 

 1. 

 1. 



346 cm ai 



391 

 3.% 

 879 

 083 

 410 

 374 

 959 

 604 

 443 

 899 

 573 

 379 

 131 

 794 

 675 



ai 

 tti 



0.1 



a\i 



0.2 

 Ct2 

 0.2 

 0.2 

 0.2 

 0.2 

 0.2 

 02 

 O2 



e 



V (volts) 



1000.0 

 1469.5 

 1681.1 

 1792.6 

 2027. 1 

 2279.3 

 2819. 1 

 3114.7 

 3421.5 

 3521.5 

 4253.5 

 4788.6 

 5183.3 

 5786.5 

 6873.5 

 7361.8 



Vv 



31.6 

 38.2 

 41.0 

 42.3 

 45.0 

 47.7 

 53.1 

 55.8 

 58.5 

 59.8 

 65.2 

 69.2 

 72.0 

 76.1 

 82.9 

 85.8 



Shortest observed wave-length 



Xxio« 



8.141 

 7.091 

 6.639 

 5.386 

 5.175 

 3.597 

 3.328 

 2.831 

 2.782 

 2.234 

 2.003 

 1.775 

 1.510 

 1.316 

 1.026 



cm /3i 



"71 

 "/3i 



"72- 

 "7i 



74 

 "72- 

 "72- 

 "72- 



73 



73 



"73 

 "74 



■73 



■73 

 -73 

 -73 



V (volts) 



1514.6 

 1739.2 

 1857.4 

 2289.4 

 2382.8 

 3150.1 

 3705.2 

 4355.7 

 4432.4 

 5519.7 

 6156.25 

 6947. 04 

 7755.3 

 9370. 

 12018.5 



Vv 



38.9 

 41.7 

 43.1 

 47.9 

 48.8 

 56.1 

 60.9 

 66.0 

 66.6 

 74.3 

 78.5 

 83.4 

 88.6 

 96.8 

 109.6 



