Show THE CIRCUIT IN geophysical prospecting the increasing interest in the use of electrical or other geophysical methods for the location of underground ore deposits has led the united states bureau of mines to study the possibilities of the use of the circuit for the measurement of the variation of ground an important factor in this means of ini mineral prospecting the may be used to measure the various average at different depths from froin the surface or to compare the various average at the same depths with its use it is possible to locate the direction of the dip and strike of a concealed intrusion such as a body of ore about three sites or areas can be measured in one day to a depth of ft by a crew of three men the as it is built at present is not entirely suited for geophysical prospecting states dr F W lee in technical paper just issued by the bureau various improvements which would help in the operation of this instrument in the locating of underground ore bodies are summarized in this paper |