( 711 of 711 ) |
United States Patent | 3,594,633 |
Barringer | July 20, 1971 |
A geophysical exploration method and apparatus utilizing VLF fields produced by distant transmitters as a source of primary field. The vertical electric alternating field component of the primary field is used as a stable reference against which variations in magnetic alternating field components caused by inhomogeneities in earth conductivity can be measured.
Inventors: | Barringer; Anthony Rene (Willowdale, Ontario, CA) |
Assignee: |
Barringer Research Limited
(Rexdale, Ontario,
CA)
|
Appl. No.: | 04/804,780 |
Filed: | March 6, 1969 |
Mar 09, 1968 [GB] | 11,625 | |||
Current U.S. Class: | 324/76.11 ; 324/330; 324/334; 324/344 |
Current International Class: | G01V 3/15 (20060101); G01V 3/17 (20060101); G01V 3/12 (20060101); G01v 003/12 (); G01v 003/16 () |
Field of Search: | 324/3,4,6,7,8 |
2268106 | December 1941 | Blau |
2642477 | June 1953 | Puranen et al. |
2677801 | May 1954 | Cagniard |
2931973 | April 1960 | Puranen |
3087111 | April 1963 | Lehan et al. |
3389331 | June 1968 | Vexler |
3422345 | January 1969 | Muse |
118,562 | Jul., 1958 | SU | |||