1008 Drs. Foote, Meggers, and Mohler on Excitation of 



M.A. 



1 



30 ' 60 



volts. ; volts. 



1 



20 



volts. 



10 

 volts. 



7 5-5 

 volts, j volts. 



3-2 



volts. 



Notation. 



Intensity. 



3674-1 



3829-36 



32-31 



38-29 



* 48-24 



2 — 



8 

 10 

 15 



3 



1 



10 



10 



10 



3 



1- 



12 

 12 

 12 



2 



10 

 10 

 10 





2 





L 







2^,-iw 



2j* 2 -3d 



2p x -Sd 

 4^-32) 



* 50-40 1 2 



59-24 1 3 



3878-58 j 4 



390402 | 5 



38-43 ! 7 



3986-79 10 

 4057-63 ' 12 

 4167-39 15 

 *4242-47 1 

 4351-91 18 



2 

 3 

 4 

 6 



8 



1 

 1 

 2 

 3 

 6 



2 



3 

 5 



7 















4<tf 2 -3 5) 

 2P-13D 

 2P-12D 

 2P-11D 

 2P-10D 



10 

 12 

 14 

 1- 

 16 



10 

 15 



30 



40 



10 

 15 

 25 



30 







•• 









2P-9D 

 2P-8D 

 2P-7D 



43)-10S3 

 2F-6D 



* 84-47 2 

 *4390-41 j 3 

 ♦4427-995 ' ) 



* 33-991 ! I 2 



* 36-48 | 



1 

 3 



2 



1 



2 



1 















-1 



3^ 2 -5:£) 

 3^-5 2) 

 3$,, -4- £ 

 3^-4" ® 

 4£)-9!>B 



* 81-129 h - 



*4481-327 J 



*4534-26 ! 2- 

 1 4571-10 20 

 1 4703 00 | 15 



5 



1 

 15 



10 



8 



20 

 15 



i*5 



10 



"5 





5 





5 



3S) 2 -4 5B 

 33) 1 -458 i 

 4$-9# | 

 l-SS-Sp, 



2P-5D j 



*4739-59 ! 7 



i 5167-38 ! 7 



72-70 : 8 



5183-67 9 



5528-42 ; 2 



5 

 5 

 7 

 8 

 2 



}10 



7 

 1 



}io 



J 



8 



('- 









"f 



4£)-823 ■ 

 2p 3 -l -5s j 

 2/> 2 — L -5s | 

 2p l -l-5s i 

 2P- D 



5711-34 1 



1 



1 



... 









2P-3-5S i 



* denotes enhanced lines. 



dumber. 



Volts. 



Milliarnperes. 



Time of exposure 



25 



30 



300-500 



3 hours. 



15 



60 



400 



15 minutes. 



26 



20 



1200 



2 hours. 



13 



10 



300 



10 minutes. 



23 



7 



5 



45 minutes. 



21 



5-5 



1-4 



3| hours. 



24 



3-2 



1 



15 hours. 



