X- Rays from Boron and Carbon. 



157 



the quantum relation (Ve = hv) the potential V is pro- 

 portional to v, then the square root o£ the potential should 

 also be almost exactly a linear function of the atomic 

 number. We shall use the potential V in the discussion. 



If the relation between y/y and the atomic number were 

 strictly linear, then the difference between successive values 

 of ^Y would be identical. However, they decrease very 

 slightly. For purposes of extrapolation it has been assumed 

 that this slight decrease is regular and holds for elements 

 of atomic number below 11, just as for those above 11. In 



Fig. 7. 



V400 



VToo 









i/p / 









f\ / 









/& 









/ / 





O X ray crysta/ ana/ys/'s. 





W / 





H Th/s invest/grat/on. 





*•/* 





X /fi/rt/f's <sa/ues. 





















A /a6 . 



0' 















*-'/?/ 















M' / 

















m / 

















/ft v e 

















/' P 

















/ 













/ 















1 

 1 



V 

















/ / 



















/VA 

















1/ 







X 









' 











v> ts 



A 



) / 



I 3 ' 



V<** | 



. 









H He Li Be B C N F Ne Na Mg Al Si P S 



this way the values for elements from lithium to neon have 

 been calculated. CThe departure from the straight line is 

 hardly noticeable in the graph, fig. 7.) The fact that the 



