ELECTRICITY; 



45 



(60) SPECIFIC INDUCTIVE CAPACITIES. 



Air 1 



Vacuum ' 9994 



Hydrogen ;0'9997 



Carbon dioxide I'OOOS 



Ethene 1'0007 



Sulphur dioxide 1-0037 



Benzene 2 '199 



Carbon disulphide... 1'81 



Petroleum 2 '07 2 '03 



Turpentine 2 '16 



Ebonite ...... .......... 2'284 



Glass .:-. ................ 8-258 -1-9 



India rubber ......... 2'8 2'22 



Outta percha ......... 4 '2 2 '462 



Chatterton's com- 

 pound .............. 2-5474 



Hooper's composition 3'1 

 Smith's gutta percha 3 '59 3 '4 

 Mica ...... ............. 5 



Paraffin (solid) ... 



Resin ................... 1*77 



Shellac ................ 2'74 1'95 



Sulphur ...... ......... 2'58 1'93 



Tar ............. ,... ...... 1-8 



Yellow wax ......... 1'86 



(61) CONTACT DIFFERENCES OF POTENTIAL IN VOLTS. 



In air at about 18 C. 



