112 Production of Sparks in Air and other Gases. 

 Table III. — Carbon Dioxide. 



Length of 

 spark, in 



centimetres. 



Electro- 

 static force, 



Total force, 



Length of 



Electro- 

 static force, 



Total force, 



per cen?im. 

 C.S.G. 



C.G.S. 



spark, in 

 centimetres. 



per centim. 

 C.G.S. 



C.G.S. 



•0047 



344-5 



1-619 



•2380 



141-6 



33-701 



•0092 



305-7 



2-812 



•2688 



138 



37-094 



•0155 



283-7 



4-397 



•3257 



129-1 



42-048 



•0237 



268-8 



6 371 



•3922 



1230 



48-241 



•0282 



252-0 



7-106 



•4290 



1200 



51-480 



•0327 



233-3 



7-629 



•4911 



1160 



56-968 



•0391 



224-3 



9-357 



•5274 



1126 



59-385 



•05 JO 



210-0 



11-340 



•6170 



109-3 



67-438 



•0853 



182-0 



15542 



•7330 



107-2 



78-577 



•0940 



1790 



16-826 



•8132 



1040 



84-573 



•1209 



174-9 



21-145 



•8752 



102-5 



89-708 



•1430 



164-2 



23-481 



•9381 



1022 



95-874 



•1728 



1570 



27430 



1-0275 



101-3 



104086 



Table IV. — Hydrogen. 



Length of 



spark, in 



centimetres. 



Electro- 

 static force, 

 per centim. 

 C.G.S. 



Electro- 

 static force, 

 total C.G.S. 



Length of 



spark, in 



centimetres. 



Electro- 

 static force, 

 per centim. 

 C.G.S. 



Electro- 

 static force, 

 total C.G.S. 



•0210 



244-4 



5-132 



•3898 



84-6 



32-977 



•0409 



184-6 



7-550 



•4335 



82-1 



35-590 



•0542 



156-4 



8-477 



•4975 



778 



38-705 



•0691 



144-7 



9-989 



•5296 



75-7 



40 091 



•0843 



134-0 



11-296 



•5640 



75-1 



42-356 



•0970 



131-5 



12755 



•6400 



72-5 



46-400 



•1056 



127 4 



13453 



•7240 



690 



49956 



•1275 



1200 



15-300 



•7930 



67-7 



53-686 



•1552 



112-9 



17-522 



•8238 



66-9 



55112 



•1972 



1040 



20-509 



•8896 



65-6 



58-358 



•2300 



99-3 



22-839 



•9750 



639 



62-302 



•2865 



941 



26960 



10109 



630 



63-687 



•3215 



92-5 



29-739 



1-0870 



62-5 



67-937 



On examining the curves, it -will be remarked that, although 

 the values of the electrostatic force differ for different gases, 

 the general form of the curves which give the relation between 

 the potential and length of spark is nearly the same for all. 

 In every case there seems to be a sudden fall in the electro- 

 static force per centimetre at first, after which the change 

 becomes more and more gradual and uniform. It further 

 appears probable that the value given by Sir William Thomson 

 as the limit to which the force per unit length approaches is 



somewhat too 



Indeed, it seems impossible to deter- 



