686 Prof. Fleming and Mr. Richardson on the Effect of an 



The same experiments were then repeated with the same 

 spark-gap lengths but without air-blast. It was found to 

 be more difficult to obtain good points for resonance curves, 

 but the final results are as shown in the figures in Table V. 



1-0 

 0-9 

 0-8 

 0-7 



0-6 



§04 

 io-3 

 |(K 







GAP /mm, 









































/ 













/ 









































































n 









Gap 



i-O 



n.o 





G/ip 5 



?nm 



















0-8 

 07 



kO-3 



§0-1 

 n 











\ 













\ 















\ 













\ 































































•97 -98 ■% 1-00 1-01 I-O? 1-03 -97 -98 -99 1-00 1-01 1-02 1-03 . 37 -98 -99 1-00 1-01 1-02 103 

 Frequency pat/o n //v Frequency p/ir/o %/ Frequency fr/rr/o %, 



Fig. 2. — Resonance Curves taken without air-blast on spark-gap. 

 To economise printing we shall write X for the quantity 



100 a/A, and Y for 7r\/-— -, and Z for the mean value 



£ i /xr V A-" — a 2 ' 



or 1—n/N. 



Then since the values of X and Y are the same in all cases 

 they apply to each spark-length, and need not be repeated if 

 it be understood that the six rows of figures correspond 

 respectively to X=95, 90, 85, 80, 75, and 70 per cent. We 

 accordingly compress the final results for the 1, 2, and 3 mm. 

 spark-gap unblown on in one Table V. 



Table V. 



— 1, 2, and 3 mm. 



spark-gaps without 



air-blast. 



l-»/N=Z. 



D=di+d a . 



1 mm. 



2 mm. 



3 mm. 



1 mm. 



2 mm. 



3 mm. 



•0072 



•008 



•0067 



•069 



•0766 



•0642 



•00975 



•01 



•0092 



•0631 



•0647 



•0595 



•0017 



•0124 



•0116 



•0595 



•0631 



•0591 



•0141 



•0146 



•0139 



•0592 



•0612 



•0582 



•0164 



•0172 



•0162 



•0587 



•0617 



•0581 



•0187 



•0193 



•0185 



•0576 



•0595 



•0570 



- 



Vlean Values 





•0613 



•0645 



•0593 





