DESCHIPTION OF PLATKS 



Plate I and Plate II. Stark effect of hydrogen lines. Fig. 1. '1, 3 and 4. Comparison for 

 H(i, Hß, Hy and llg of theoretical estimate of relative intensities of components with Stark's obser- 

 vations (see page 55j. 



Fig. 5. Reproduction of Stark's photographs of effect of electric field on Hß, Hy, and H§ (see 

 page 54). 



Fig. 6. Theoretical estimate of effect of electric field on hydrogen line H^ (see page 63). 



Plate III. Stark effect of helium lines. Fig. 7, 8. !l Theoretical aspect of electric resolution 

 of 4686 A, 3203 A, 2733 A, compared with the rough an:ilysis of this resolution observed by Nyquist 

 and by Stark, the observed components being indicated by ariows (see page 64). 



In all figures of theoretical estiinale of intensities of Stark effect components, components repre- 

 sented by dots mean that the theoretical estimate for the intensity of these components is too small 

 to be conveniently represented on the same scale as other components. 



Plate IV. Fine structure of hydrogen and helium lines. Fig. 10, 11, 13. Theoretical fine 

 structure of helium lines 4686 A and 3203 A, and of hydrogen line Hf^, compared with Paschhn's 

 observations. Lengths of drawn components proportional to estimate of intensities of components of 

 fine structure for undisturbed atom. For the sake of convenience, however, component (04 03) in 

 fig. 1Ü and component (03 — »■ 02) in fig. 13 are represented by lines 2,5 times shorter than that corres- 

 ponding to scale of other components. Dotted lines represent estimates of intensities of new components 

 corresponding to electric field of 600 Volt/c^ in fijr. ](), of 90 Volt i„ fi». \\ and of 100 Volt j,, 

 fig. 13 (see pages 85, 90 and 93). 



F'ig. 12. Theoretical estimate of intensities of original components of fine structure of helium line 

 5411 Å, compared with Paschen's observations (see page 91). 



Components represented by small squares in the case of original components and by one dot in 

 the case of new components have generally theoretical intensities which are far too small to be con- 

 veniently represented on the scale used. 



