100 



Miss H. Brooks on the Damping of the 



Spark-length. 



y,/y r 



1 mm. 



•905 



3 >, 



.88 



5 „ 



•885 



7 „ 



•865 



9 n 



•86 



11 „ 



•845 



13 „ 



•845 



With smaller capacities the increase in the damping with 

 increase of spark-length was much more rapid. The fol- 

 lowing values were obtained with a capacity of 725 C.G.S. 

 units. 



Spark-length. yzhv 



2 mm. -875 



3 



5 



7 



9 



11 



•84 



•765 



•68 



•59 



•515 



Fio-. 4. 



























/ 



/ 





•55 























/ 



< 











1 













0*> >< 













•65 

















1 



6" / 













S 3 '70 















V 



/ 















5 



1 -75 















/ 

















P 



•80 

















































c 



= 25 



00 I 



:.s. 



#7Z£< 



S 







J 



/ 

















































































4 5 6 7 8 



Spark-length in millims. 



10 



The curves showing the relation between the spark-length 

 and damping in these two cases are given in fig. 4. 



