Short Spark-Discharges. 699 



given below are chosen from a great number 



The results 

 in such a way as to illustrate the 

 investigation. The notation employed is as follows : 



total range covered bv this 



f n = distance in number of fringes of the nth order between 



the discharge-surfaces when the spark passed. 

 d = distance in /jl/jl between the discharge-surfaces. 

 V = difference of potential at which the spark occurred. 

 Vt= interval by which the potential was changed during 



the test.' 

 a = time in seconds, after increasing the potential to its 



final value, before the spark occurred. 

 wt= empirically assigned weight which depended on the 



sharpness and drift of the zero as well as on Vt 



and a. 



Fio-. 5. 



50 

 40 



V 







! 



! 1 ! 











i JfA^T 













^a^t 



II i 1 







\ 





\ 







J A 















i J 



10 

 



B ! 













j--t-"r~ 























1 i 





^^ 









i 







1 1 1 



: 



o 60 a 



:: 



IJ u 



200 







3 



DO 









4 



00 





DA- 



TABLE for fio-. 5. 

 o 



Data taken October 2$, 1904. 



This series was taken between 24 and 27 hours after closing 

 the di -charge-chamber. Thirty seconds was the time-interval 

 used between changes of potential. 



During this series the drift of the zero was not obtained. 



/, 



d. 



V. 



VI 



a. 



tut 



21 



129 



2 Mi 



9 



2 



6 



:;••; 



221 



27-6 



2 



20 



6 



4-L' 





313 



2 



15 



6 





319 



396 



2 



30 



6 



6-0 





4.V8 



2 



26 



6 



/••> 



4<i<» 



52-5 



o 



30 





