The application, technique, and theory of Gish-Rooney instruments, methods, and interpretation in electrical resistivity measurements
The foundations of electrical prospecting were laid by Fox (1830) and Barus (1882). The former discovered that electrical currents and potentials were
Public-domain full text preserved in the Mountain Man Mining Library. Original source: pubs.usgs.gov.
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' ·' Dote 1 Instrument No.: Description of Location: sec.- County: Other Description: Bearing of Line: Elevations: G P--1 P- 2 Diagram of ground surface traversed bt electrodes Giva pl~tudes ?gove G on ,n ,cotes pes> Description 8 Location of disturbing factors l ( Power lines, cables, metal fences, gos and water mains, grounded cables, etc.) Weather conditions~ Description of the geological materials : ,I )
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N'"'o°tes a Remor"-s c, P2 P1 a E Datel Instrument No.: Description of Location: sec.-- R._ County: Other Description: Bearing of Line: Elevations: G P-1 P-2 Diagram of ground surface traversed b;r'. electrodes on ,n ,cote s pes Description a Locat i( of disturbing factors t ( Power lines, cables, metal fences, gos and water mains, grounded cables, etc.) Weather conditions~ Description of the geological materials: u.
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rF igur e 3 r FIG. 'J'J. Current fractions,J1, in the surface stratum of a two-layer earth. a/hi= (half of current electrode spacing)/(surface layer thickness); a-=u2/u1 (conductivity of sec --~ond layer)/(conductivity of surface layer).
Figure 40 r. k FIG. 40. Current fractions,J1, in the surface stratum of a two-layer earth. a/h1 (half of current electrode spacing) /(surface layer thickness); k (r -er)/(r +er) whereer= (con ductivity of second layer)/(conductivity of f.urface layer).
rf' d- l Figu re r FIG. -:6: Current fractions, /1, in the surface stratum of a three-layer earth, having the same conductivity in the first and third layers : middle layer thickness= sur face layer thickness, (h= 2); . : middle layer thickness= 2 · surface layer thickness, (h= 3). Rest of notation as in Fig. 3. ·
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Current fractions, f 2, in the middle stratum of a three-layer earth, having the same conductivity in the first and third layers. Notation as in Fig. 6.
Figure 43 a/hi Frc.¥.Current fractions, f 3, in the deepest stratum of a three-layer earth, having the same conductivity in the first and third layers. Notation as in Fig. 6.
Figure f k FwJ.i{ Current fractions, / 1, in the surface stratum of a three-layer earth, having the same conductivity in the first and third layers. Notation as in Figs. 4 and 6.
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k FIG.~. Current fractions,/3, in the deepest stratum of a three-layer earth, having the same conductivity in the first and third layers. Notation as in Figs. 4 and 6.
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