434 EXPLORATION GEOPHYSICS 



is somewhat thicker in the north, 1200 to 2000 feet, than at the Lost Hills, 

 where it is from 1200 to 1400 feet in thickness. 



The outstanding density variation in the area studied is the lightness 

 of the Reef Ridge beds at Lost Hills. The gravity anomalies would indicate 

 a probable transition within the Reef Ridge formation from the Lost Hills 

 northward to the Kettleman Hills north dome. There is also a distinct 

 possibility that the light diatomaceous material deposited at the Lost Hills 

 was not present farther north along the trend. 



GRAVITATIONAL METHODS 



UNITED STATES PATENTS 



1,796,150 Issued Mar. 10, 1931. Richard Hamer. "Gravity-Determining Device." 



1,829,876 Issued Nov. 3, 1931. Stefan Rybar. "Eotvos Torsion Balance." 



1,843,342 Issued Feb. 2, 1932. Ernest L. Jones and Herman Shaw. 'Torsion Balance 



and the Like." 

 1,858,384 Issued May 17, 1932. Josef Andre. 'Tendulum Apparatus." 

 1,861,229 Issued May 31, 1932. Ludwig Blau. "Torsion Balance." 

 1,868,010 Issued July 19, 1932. Hans Haalck. "Torsion Balance." 

 1,888,976 Issued Nov. 29, 1932. Ludwig W. Blau. "Apparatus for Measuring Relative 



Values of Gravity." 

 1.927,150 Issued Sept. 19, 1933. Alfred Berroth. "Measuring Instrument for Investi- 

 gating Gravitation." 

 1,951,226 Issued Mar, 13, 1934. Peter Irving Wold. "Measurement of Gravitational 



Forces." 

 1,963,252 Issued June 19, 1934. Orley H. Truman. "Optical Torsion Balance." 

 1,975,516 Issued Oct. 2, 1934. Alexander McLean Nicolson. "Gravity Indicator." 

 1,987,786 Issued Jan. 15, 1935. Otto Meisser. "Pendulum for Gravity Determination." 

 1,988,508 Issued Jan. 22, 1935. Desiderius Pekar and Stefan Rybar. "Eotvos Balance." 

 1,988,527 Issued Jan. 22, 1935. Orley H. Truman. "Gravity Meter." 

 1,995,305 Issued Mar. 26, 1935. Harvey C. Hayes. "Method and Apparatus for 



Determining the Force of Gravity." 

 1,998,345 Issued April 16, 1935. Orley H. Truman. "Gravity Meter with 



Compensator." 

 2,000,948 Issued May 14, 1935. Harvey C. Hayes. "Apparatus for Determining the 



Force of Gravity." 

 2,032,381 Issued Mar. 3, 1936. Paul P. Stoutenburgh. "Method and Apparatus for 



Determining the Force of Gravity." 

 2,044,079 Issued June 16, 1936. John C. Karcher. "Apparatus for Determining Sub- 

 surface Tectonics of the Earth." 

 2,077,390 Issued April 20, 1937. Ludwig W. Blau. "Frequency Comparing Device for 



Determining the Force of Gravity." 

 2,080,062 Issued May 11, 1937. Henry Rainbow. "Torsion Balance." 

 2,089,164 Issued Aug. 3, 1937. Hermann Imhof. "Suspension for Eotvos Balance." 

 2,089,745 Issued Aug. 10, 1937. Anton Graf. "Gravity Instrument." 

 2,090,713 Issued Aug. 24, 1937. Harold A. Wilson. "Gravity Measuring Device." 

 2,097,156 Issued Oct. 26, 1937. F. Holweck. "Gravity Pendulum." 

 2,105,146 Issued Jan. 11, 1938. Hans Haalck. "Gravitation Measuring Instrument." 

 2,137,963 Issued Nov. 22, 1938. C. A. Heiland. "Gravimeter." 



2,148,678 Issued Feb. 28, 1939. L._W. Blau and A. B. Bryan. "Apparatus for Com- 

 paring a Plurality of Oscillatory Systems." 

 2,149,953 Issued March 7, 1939. A. K. Birnbaum. "Automatic Leveler for Gravity 



Measuring Instruments." 

 2,150,405 Issued March 14, 1939. S. A. Scherbatskoy. "Gravity Meter." 

 2,159,082 Issued May 23, 1939. Kenneth Hartley. "Apparatus for Making Gravity 



Measurements." 

 2,179,892 Issued Nov. 14, 1939. A. R. Lindblad. "Apparatus for Determining Gravity." 

 2,182,298 Issued Dec. 5, 1939. Johan D. Malmqvist. "Method of Measuring Gravity." 



