54 SYLVAIN J. PIRSON 
TABLE I 
eee 
a 10 20 40 60 80 100 
p’:/pa|.982 -920 . 718 582 -505 - 463 
tl Ky, hy/a hy hy/a hy hi/a hy hy/a hy hi/a hy 
o.I 5 1 Omedister2 _ = _ — = = = — 
0.2 S MQ20; 1540) 220) 40150 soos — == — — — 
0.3 PUTA 23641245) eS 0) |ie-5 0.03, | aes eee —- — 
0.4 9 (1.33 26.6] .588 23-5 | -33% 19-9 190 15:2] .088 8.8 
ONS 1.51 30.2 | .709 28.3 | .436 26.1 | .323 25-8] .253 25-3 
‘0.6 #2 | 1.625 32-5 | -799 31-9] -540 32-4 | -422 33-7 | -357 35-7 
0.7 11.765 35-5 | -889 35-6] .621 36.6] .497 39-8 | -433 43-3 
0.8 S 1.835 36.7 | -969 38.7 FOO 42.0] .579 46.3 510 51-0 
0.9 1.095 38.1 |I.039 41.5 770 46.0 648 51.8 578 57-8 
1.0 2.00 40.0 |1.118 44.8 834 50.0 707 50.4 640 64.0 


determination to the second layer may be considered as very good. 
We have: #:=33 feet and K,=o0.6. Thus the value of the resistivity 
1s lO 
of the second layer is pp=p'1 (=>) = 2,630 ohm feet. By mak- 
1— Kk, 
making use of the inflection point on the lower part of the curve 
situated approximately at the electrode spacing 300 feet, the total 
thickness of the two up layers is estimated at ma 300= 200 







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40 
Fic. 6.—Depth-resistivity factor curves. 
714 
