"The object of this study was to design, construct, and test an electromagnet that could, from an underground location, generate a magnetic field which could be located at the surface, and that was portable enough to be carried through a cave. This could then be used to locate points in a cave relative to the surface.
A 20 foot solenoid composed of four five-foot sections was built and magnetized by a lightweight rechargeable four-cell eight volt battery. The total weight of the equipment was 30 pounds.
The magnet was calibrated by erecting it and measuring its vertical intensity with a Ruska magnetometer. These measurements were made at several distances and at different current strengths to determine the pole strength. Then the magnet was tested at a cave of known depth to check the results.
Theoretical consideration was given to the strength of the magnet and its effect at various distances. An IBM 1620 digital computer was used to calculate points of maximum vertical intensity of the magnetic field.
The results showed very good accuracy, but a depth penetration of 50 feet was the maximum obtainable. Changes needed to increase the depth penetration to 100 feet are also discussed"--Abstract, page ii.
Frizzell, Don L. (Donald Leslie), 1906-1972
Rupert, Gerald B., 1930-2016
Morgan, Ray E., 1908-1997
Fuller, Harold Q., 1907-1996
Geosciences and Geological and Petroleum Engineering
M.S. in Geology
Missouri School of Mines and Metallurgy
vi, 49 pages
© 1963 Anthony DelPrete, Jr., All rights reserved.
Thesis - Open Access
Print OCLC #
Link to Catalog Record
Del Prete, Anthony Jr., "The location of underground points by means of a magnetic dipole" (1963). Masters Theses. 2823.