It is hoped that the following report may serve as the groundwork or basis for further applications of analog computer techniques to the field of electrical well logging interpretation. The author feels that this type of semiautomatic interpretation can be invaluable both as an exploratory tool and as a labor saving device in the interpretation of logs. From the exploratory view point, various combinations of mud resistivity, mud cake resistivity, and formation resistivity, may be tried in a matter of minutes to simulate a log for the purpose of experimental interpretation; while from the labor saving view point, countless hours of point by point tabulation of data may be saved by a continuous analog solution. The particular emphasis of this report deals with interpretation of the Contact Log, but the author feels that this same approach may be applied to any number of the other electrical logs now being run commercially. The author wishes to express his appreciation at this time to the Electrical Engineering Department of The Rice Institute for its cooperation in making available an analog computer so that the efforts of this research might be tried. In particular, the author wishes to thank Dr. Paul E. Pfeiffer for his constant guidance and suggestions, and the Halliburton Oil Well Cementing Company for its generous donation of time and information in making this investigation possible.