932 EXPLORATION GEOPHYSICS 



2,024,921 Issued Dec. 17. 1935. William G. Green. "Method of Determining Slope 

 of Subsurface Rock Beds." 



2,028,286 Issued Jan. 21, 1936. Earle W. Johnson. "Seismic Surveying." 



2,046,104 Issued June 30, 1936. L. W. Blau & L. Statham. "Method and Apparatus 

 for Seismic Prospecting." 



2,049,236 Issued July 28, 1936. Benjamin B. Weatherby. "Surveying Underground 

 Structures." 



2,051,153 Issued Aug. 18, 1936. Frank Rieber. "Method and Apparatus for Re- 

 cording Elastic Waves." 



2,054,067 Issued Sept. 15, 1936. L. W. Blau & L. Statham. "Method and Apparatus 

 for Seismic-Electric Prospecting." 



2.055.476 Issued Sept. 29, 1936. L. W. Blau. "Seismic Prospecting." 



2.055.477 Issued Sept. 29, 1936. L. W. Blau. "Electrical Circuits for Seismic 

 Prospecting." 



2,055,618 Issued Sept. 29, 1936. L. W. Blau. "Tamping for Explosives." 

 2,058,764 Issued Oct. 27, 1936. L. W. Blau. "Reflection Shooting Procedure for the 



Accurate Determination of Dip." 

 2,059,018 Issued Oct. 27, 1936. Willard North. "Subsurface Surveying." 

 2,062,151 Issued Nov. 24, 1936. Benjamin B. Weatherby. "Method of Making Sub- 

 surface Determinations." 

 2,062,784 Issued Dec. 1, 1936. William G. Green. "Seismograph." 

 2,063,820 Issued Dec. 8, 1936. K. L. McHenry. "Method of Recording Seismic 



Waves." 

 2,064,451 Issued Dec. 15, 1936. Vanderveer Voorhees. "Seismic Surveying." 

 2,067,636 Issued Jan. 12, 1937. Carl A. Heiland. "Vibration Detector." 

 2,081,350 Issued May 25, 1937. L. W. Blau. "Method and Apparatus for Eliminating 



Low Frequencies." 

 2,087,120 Issued July 13, 1937. H. Salvatori, et al. "Method of Making Weathering 



Corrections in Seismic Surveying." 

 2,087,702 Issued July 20, 1937. Leo J. Peters. "Method and Means for Recording 



Terrestrial Waves." 

 2,088,588 Issued Aug. 3, 1937. Oscar E. Dudley. "System of Geological Exploration." 

 2,089,983 Issued Aug. 17, 1937. Norman H. Ricker. "Method and Means of Geo- 

 physical Prospecting." 

 2,095,676 Issued Oct. 12, 1937. H. R. Prescott. "Method of Making Geological 



Explorations." 

 2,099,536 Issued Nov. 16, 1937. J. Neufeld & S. A. Scherbatskoy. "Method and 



Apparatus for Seismic Prospecting." 

 2,099,837 Issued Nov. 23, 1937. L. W. Blau. "Seismic Reflection Method." 

 2,101,408 Issued Dec. 7, 1937. D. S. Muzzey, Jr. "Seismic Surveying Method." 

 2,111,643 Issued Mar. 22, 1938. H. Salvatori. "Seismometer." 



2,117,365 Issued May 17, 1938. H. Salvatori and J. N. Walstrum. "Seismic Surveying." 

 2,133,484 Issued Oct. 18, 1938. S. Sherar. "Use of a Distributed Charge in Seismic 



Prospecting." 

 2,144,812 Issued Jan. 24, 1939. F. Rieber. "Method of Geophysical Exploration." 

 2,147,060 Issued Feb. 14, 1939. F. F. Reynolds. "Electromagnetic Wave-Pickup 



Instrument." 

 2,148,422 Issued Feb. 28, 1939. L. W. Blau. "Method of Determining the Dips of 



Geological Strata with Substantially Vertical Reflections." 

 2,148,679 Issued Feb. 28, 1939. L. W. Blau, R. R. Thompson and W. D. Mounce. 



"Use of High Frequencies in Measuring Changes in Electrical Impedance." 

 2,149,427 Issued March 7, 1939. L. Y. Faust. "Subsurface Exploration." 

 2,151,878 Issued Mar. 28, 1939. B. B. Weatherby. "Seismic Surveying." 

 2,153,920 Issued April 11, 1939. L. W. Gardner. "Seismograph Prospecting." 

 2,154,548 Issued April 18, 1939. B. B. Weatherby. "Seismic Surveying." 

 2,155,507 Issued April 25, 1939. F. Rieber. "Wave Record Analyzer." 

 2,156,198 Issued April 25, 1939. S. A. Scherbatskoy. "Seismic Prospecting." 

 2,156,259 Issued May 2, 1939. L. W. Blau. "Seismic-electric Prospecting by Means 



of Continued Waves." 

 2,156,624 Issued May 2, 1939. L. Y. Faust. "Subsurface Seismic Surveying." 

 2,158,198 Issued May 16, 1939. H. R. Prescott. "Method and Apparatus for Making 



Geological Explorations." 



