On Electromotive Forces of Contact. 



43 



No. of 

 Experi- 

 ment. 



Am l = 

 2 ' 



B* 2 = 



V. 



2 



C* 3 . 



5 0. 3 . 



11 



9. 



* 



Va« x sin 9. 



1 



33-29 



52-65 



10-37 



8646 



75° 40 



i 

 5 43 



5-590 



o 



34-43 



59-74 



11-50 



9583 



75 19 



5 38 



5-676 



3 



3709 



92-14 



17-34 



144-50 



72 45 



6 25 



5-816 



4 



70-38 



86-06 



17-43 



145-22 



77 4 



5 21 



' 8176 



5 



81-17 



81-00 



1721 



143-42 



77 45 



5 24 



8804 



6 



8497 



29-03 



7-83 



65-26 



80 56 



5 4 



9-103 



7 



8-21 



101-59 



14-31 



119-26 



60 17 



4 50 



2-488 



No. of 

 Experi- 

 ment. 



r r 



r 2- 



Ii 2 



2 2 ' 



Power of 

 internal 



magnetic 

 work = H. 



H 



A^sin-'e' 



1 



2-01 



2-51 



66-91 



13215 



84-96 



2-72 



2 





2-36 



69-20 



140-99 



85-17 



2-64 



3 





1-96 



74-55 



180-59 



102-63 



3-03 



4 





... 



141-46 









5 





2-87 



163-15 



232-47 



17915 



2-31 



6 





4-77 



170-79 



138-47 



172-82 



2-09 



7 





0-72 



1650 



7314 



12-73 



2-06 



VI. On Electromotive Forces of Contact. 

 By Charles V. Burton, B.Sc* 



THE principal object of this paper is to discuss the seats 

 of the electromotive forces developed by the contact of 

 conductors, and by considering the transformations of energy 

 which occur when two insulated conductors are brought into 

 contact, an attempt is made to give a logical demonstration 

 of some of the views put forward. In the latter part of the 

 paper a description is given of some experiments on the 

 nature of the electrification of non-conductors by contact or 

 friction. 



When two conductors are brought into contact, an electro- 

 motive force (E) is set up between them, which drives 



* Communicated by the Physical Society : read April 28, 1888. 



