Spark- Leiiyth of an I ad act ion- Coll, 



Table III. — Break-Sparks with Condenser. 

 Current broken in primary = 2"5 amperes. 



145 



Material of 



Capacity in 



Secondary Spark-length in 



Millimetres. 









Primary Poles. 



Microfarads. 



I. 



Slow T3rctifc 



II. 



III. 







Moderately 



Very Quick 









Quick Break. 

 9-5 



Break. 

 11 









8-5 





•04 



220 



Same as for 



Same as for 





•07 



27-0 



slow break. 



slow break. 





10 



29 







Platinum. 



•13 



•27 



•44 



1-04 



1-51 



28-5 

 28-5 

 275 

 240 

 22-0 



'" 



» 









70 



19 



22 





•07 



27-0 



Same as for 



Same as for 



Platinum and 



•13 



28-5 



slow break. 



slow break. 



Mercury 



•27 



29 



} 





under 



•44 



28 



,, 



(J 



Alcohol. 



•60 



•90 



1-54 



27-0 

 25-0 

 22-5 



: 



" 









2-0 



75 



10 





•04 



10-0 



11-5 



Same as for 





•07 



190 



24 



mod. quick, bk. 



Copper. 



•13 



240 



27-0 





•27 



26-5 



29 







•44 



27-0 



285 







•90 



24-5 



260 



„ 





154 



215 



230 



» 









10 



7 5 



825 





•13 



1-2 



9-5 



11-0 





•27 



1-35 



180 



19-0 





■44 



2-8 



220 



23 



Carbon. 



•60 



•77 



51 

 9-0 









•90 





22-0 



23-0 





104 



120 









1-21 



120 









T54 



11-25 



20-0 



210 

 9-2 









1-0 



7-2 





•04 



65 









•07 



8-75 









■13 



11-5 



9-5 



110 





•27 



140 



135 



150 



Zinc. 



•44 



•47 



150 



22 



200 





■60 





22-5 



25 





•77 







25 





■90 



- 13-5 



200 







WO 







220 





1-54 



120 



16-0 



190 



Phil. Mag. 8. 5. Vol. 50. No. 302. July 1900. 



