GRAVITATIONAL METHODS 435 



2,183,115 Issued Dec. 12, 1939. F. G. Boucher. "Multiple Gravity Meter." 



2,185,582 Issued Jan. 2, 1940. L. W. Blau. "Multiple Component Gravity Balance." 



2,190,959 Issued Feb. 20, 1940. Stephen Baron von Thyssen-Bornemisza. "Gravity 



Measuring Instrument." 

 2,203,293 Issued June 4, 1940. Hart Brown. "Force Measuring Device." 

 2,209,140 I. Rybar. 

 2,217,123 Issued Oct. 8, 1940. J. D. Malmqvist. "Apparatus for Determining the 



Alterations of the Horizontal Components of the Force of Gravity." 

 2,217,361 Issued Oct. 8, 1940. H. M. Evjen and D. S. Muzzey, Jr. "Gravity Meas- 

 uring Instrument." 

 2,218,140 Issued Oct. 15, 1940. F. E. Wright and J. L. England. "Gravity Torsion 



Balance." 

 2,220,199 Issued Nov. 5, 1940. J. L. Bible and R. H. Ray. "Clamping Device for 



Force Responsive Element." 

 2,221,480 Issued Nov. 12, 1940. G. A. Ising. "Gravity Measurements." 

 2,225,566 Issued Dec. 17, 1940. J. McD. Ide. "Gravity Meter." 

 2,225,582 Issued Dec. 17, 1940. J. L. Bible. "Gravity Meter Clamp." 

 2,232,177 Issued Feb. 18, 1941. J. McD. Ide. "Optical System." 

 2,239,049 Issued April 22, 1941. T. S. Morris. "Gravity Meter." 

 2,243,746—2,243,750, inclusive. Issued May 27, 1941. D. H. Clewell. "Gravity Meter." 

 2,253,472 Issued Aug. 19, 1941. T. B. Pepper. "Apparatus for Submarine Geophysical 



Prospecting." 

 2,255,876 Issued Sept. 16, 1941. D. H. Clewell and H. A. Maeder. "Gravity Meter." 

 2,258,613 Issued Oct. 14, 1941. F. M. Kannensteine and F. M. Floyd. "Measuring 



Instrument." 

 2,262,165 Issued Nov. 11, 1941. D. H. Clewell. "Gravity Meter." 

 2,263,096 Issued Nov. 18, 1941. J. A. Marchand. "Gravity Measuring Instrument." 

 2,264,342 Issued Dec. 2, 1941. D. Silverman and J. L. Bible. "Geophysical Instrument 



Mounting." 

 2,265,011 Issued l3ec. 2, 1941. Sidney Siegel. "Sensitive Device for Measuring 



Forces." 

 2,277,505 Issued March 24, 1942. C. H. Barker and K. Q. Robert. "Carrying Device 



for Geophysical Instrument." 

 2,277,509 Issued March 24, 1942. D. H. Clewell. "Gravity Meter." 

 2,279,261 Issued April 7, 1942. J. M. Crawford and H. R. Prescott. "Torsion 



Gravimeter." 

 2,281,001 Issued April 28, 1942. D. H. Clewell. "Gravity Meter." 

 2,290,354 Issued July 21, 1942. R. H. Ray. "Geophysical Instrument Mounting." 

 2,290,740 Issued July 21, 1942. D. H. Clewell. "Gravity Meter." 

 2,291,628 Issued Aug. 4, 1942. G. A. Ising. "Apparatus for Relative Gravity 



Measurements." 

 2,293,437 Issued Aug. 18, 1942. L. J. B. LaCoste and A. Romberg. "Force Meas- 

 uring Device." 

 2,294,201—2,294,202. Issued Aug. 25, 1942. T. B. Pepper. "Apparatus for Submarine 



Geophysical Prospecting." 

 2,295,026 Issued Sept. 8, 1942. H. Brown and J. H. Martin. "Force Measuring 



Device." 

 2,296,330 Issued Sept. 22, 1942. L. W. Blau. "Gravity Balance." 

 2,301,396 Issued Nov. 10, 1942. A. Graf. "Gravity Meter." 

 2,303,845 Issued Dec. 1, 1942. S. Krasnow. "Apparatus for the Measurement of 



Gravity." 

 2,304,191 Issued Dec. 8, 1942. L. M. Mott-Smith. "Gravity Meter." 

 2,304,324 Issued Dec. 8, 1942. P. S. Williams. "Gravity Meter." 

 2,304,737 Issued Dec. 8, 1942. H. A. Maeder. "Mass Clamp for Gravity Meters." 

 2,304,748 Issued Dec. 8, 1942. D. H. Clewell. "Gravity Meter." 

 2,307,917 Issued Jan. 12, 1943. D. H. Clewell. "Gravity Meter." 

 2,311,771 Issued Feb. 23, 1943. G. Norgaard. "Apparatus for Measuring Gravity." 

 2,316,915 Issued April 20, 1943. O. H. Truman. "Apparatus for Amplifying and 



Measuring Small Displacements." 

 2,318,665 Issued May 11, 1943. F. G. Boucher. "Measuring Device." 

 2,319,940 Issued May 25, 1943. W. A. Marrison. "Gravitational Force Measuring 



Apparatus." 



