? — T 3 



1 15 V. 



mi 



/ 



4 



WATER 

 SURFACE 



115 V. : 2.5 V POWERSTAT HATHAWAY TYPE-SI^-A 



1.5 A - TRANSFORMER MODEL 20 OSCILLOGRAPH WITH 



NO. P4026 0-l007oOF GALVANOMETER TYPE 



MAX. OUTPUT OA-2 NO. 270000 Gl 



0FI.5AMR T~,900 CPS., 50MM/MA/M 



MULTI- ELEMENTS ON MULTI-POWER SU rN CIRCUITS 



WATER SURFACE 



SINGLE POWER SUPPLY AND MULTI- ELEMENT CIRCUIT 



SINGLE WIRE ELECTRODE 

 METAL TANK 



SINGLE POWER SUPPLY AND MULTI-SINGLE WIRE ELEMENTS 

 WITH METAL TANK AS SECOND ELECTRODE. 



SINGLE WIRE 

 ELECTRODE 



TANK WALL 



V 



D 



TWO POWER CIRCUITS AND TWO SINGLE WIRE ELEMENTS 

 WITH TANK WALL AS SECOND ELECTRODE. 



FIGURE I 



