636 EXPLORATION GEOPHYSICS 



1,997,164 Issued Apr. 9, 1935. Theodor Zuschlag. "Electrical Characteristics of 

 Conductors." 



2,012,479 Issued Aug. 27, 1935. G. U. Planta. "Device for Detecting Metals, etc." 



2,034,447 Issued Mar. 17, 1936. Marcel Schlumberger. "Method for Electrically 

 Prospecting the Undersoil." 



2,035,943 Issued Mar. 31, 1936. Arthur Broughton Edge. "Determining the Nature 

 of the Subsoil." 



2,036,193 Issued Apr. 7, 1936. James Boyd and Burt E. Moritz, Jr. "Measuring 

 Earth Resistance." 



2,046,436 Issued July 7, 1936. George Wascheck. "Ground Impedance Measurement." 



2,062,630 Issued Dec. 1, 1936. Theodor Zuschlag. "Method and Apparatus for 

 Electrical Prospecting." 



2,066,135 Issued Dec. 29, 1936. Randolph H., William M._, and Mayer Barret. "Elec- 

 trical Apparatus for Locating Bodies having Anomalous Electrical 



2.066,561 Issued Jan. '5, 1937. Gerhard R. Fisher. "Metalloscope." 



2,077,707 Issued April 20, 1937. B. S. Melton. "Electromagnetic Prospecting." 



2,094,116 Issued Sept. 28, 1937. A. E. Bowen. "Earth Resistivity Measurement." 



2,104,440 Issued Jan. 4, 1938. L. W. Blau and L. Statham. "Method of Geophysical 

 Prospecting by the Comparison of Steady State Potentials." 



2,108,463 Issued Feb. 15, 1938. Theodor Zuschlag. "Apparatus for Electrical 

 Prospecting." 



2,113,749 Issued April 12, 1938. Louis Statham. "Method and Apparatus for Com- 

 paring Electrical Transients." 



2,117,390 Issued May 17, 1938. Theodor Zuschlag. "Compensation of Alternating 

 Current Fluctuations." 



2,124,825 Issued July 26, 1938. Ludwig Machts and Bernard Rehder. "Process and 

 Apparatus for the Indirect Determination of Earth and Air Electrical 

 Conditions." 



2,137,650 Issued Nov. 22, 1938. John J. Jakosky. "Apparatus for Electrical Explora- 

 tion of Subsurface." 



2,141,590 Issued Dec. 27, 1938. E. E. Blondeau. "Resistivity Meter." 



2,147,643 Issued Feb. 21, 1939. Oscar E. Dudley. "System for Geological 

 Explorations." 



2,150,517 Issued Mar. 14, 1939. David S. Muzzey, Jr. "Electrical Exploration 

 Method." 



2,153,636 Issued Apr. 11, 1939. Atsushi Matsubara. "Method of Prospecting Under- 

 ground Ore Bodies." 



2,160,356 Issued May 30, 1939. Harry A. Fore and Albert K. Edgerton. "Geophys- 

 ical Instrument." 



2,160,824 Issued June 6, 1939. Ludwig W. Blau and Louis Statham. "Electrical 

 Earth Transients in Geophysical Prospecting." 



2,162,147 Issued June 13, 1939. Samuel S. West. "Means and Method of Electrical 

 Prospecting." 



2,165,214 Issued July 11, 1939. L. W. Blau and W. B. Lewis. "Geophysical Prospect- 

 ing with Short Electromagnetic Waves." 



2,167,95.0 Issued Aug. 1, 1939. John Jay Jakosky. "Method and Apparatus for Elec- 

 trical Exploration of Subsurface." 



2,172,271 Issued Sept. 5, 1939. Lawrence F. Athy and Harold R. Prescott. "Method 

 of Electrical Prospecting." 



2,172,688 Issued Sept. 12, 1939. W. M. Barret. "Electrical Apparatus and Method 

 for Geologic Studies." 



2,172,778 Issued Sept. 12, 1939. W. J. Taylor, Jr. "Method and Apparatus for 

 Geological Exploration." 



2,174,343 Issued Sept. 26, 1939. John Jay Jakosky. "Method and Apparatus for 

 Electrical Exploration of Subsurface." 



2,176,758 Issued Oct. 17, 1939. Stephan W. Borden. "Earth Resistance Meter." 



2,176,760 Issued Oct. 17, 1939. Stephan W. Borden. "Electrode Bridge." 



2.190.320 Issued Feb. 13, 1940. Gennady Potapenko. "Method of Determining the 

 Presence of Oil." 



2.190.321 Issued Feb. 13, 1940. Gennady Potapenko. "Method and Apparatus for 

 Geophysical Prospecting." 



