220 



Profs. D. N. Mallik and A. B. Das on 



discharge circuit, at any rate with an ordinary induction- 

 coil provided with a metallic interrupter, which is controlled 

 by a spring. Thus, with such an induction-coil of spark- 

 length in air equal to about 20 mm., when the discharge was 

 passed through the tube T 1} the interrupter worked with 

 much greater frequency than when the tube T 3 was in 

 circuit. This is verified, by the curves I and II, fig. 4. 



Fiff. 4. 



intensity 



X =/(/>). If in the above formula X were independent of 

 the discharge-tube, the straight portions of the two curves 

 ought to have been nearly coincident, if, at any rate, we 



could admit qac j , q'cc , Xgc - , Vac j . 



17. The interdependence of the various factors that enter 

 into the phenomena is clearly brought out by the curves 1, 



