1112 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1957 



for .several months in a "dry" run to establish the biological procedure, 

 as well as the techniques of measurement which are to be employed. 

 The capacitance and conductance data which have been obtained on 

 these two materials to date are presented in Figs. 6 and 7, respectively. 

 In the case of the test samples, each point represents the average value 

 for four test coils, but for the controls each point represents only one j 

 coil. 



With the GR-S test samples, there is a sharp rise in the capacitance 

 values between the second and third month, amounting to about 110 

 jujuf • Thereafter, the rise in the curve continues, the slope decreasing some- 

 what at about the eighth-month point. Over the entire test period, the 

 capacitance ranged from 632 nt^f at the start to 850 MAtf after 13 months 



Fig. 5 — General setup of conductor test showing a coil half in sediment and 

 half in sea water. 



