AbstractSimultaneous observations of electrical earth‐potentials along parallel measuring lines offer a simple but useful method to study telluric and stray‐current potentials. Different correlation‐factors between the records of both observation points can help to separate telluric from industrial stray‐current potentials. A method is suggested to eliminate disturbing impulses of stray currents from continuous telluric current recordings as those made at observatories.The influence of stray currents can also be eliminated from potential readings of an artificial current as applied in geoelectric measurements with the four‐point‐method. The elimination is possible by a simultaneous observation of the stray‐current potentials on an equipotential line of the artificially generated field. The recording examples show an appreciable improvement of the signal‐noise ratio without increase in the current. The method is useful for geoelectrical prospecting in areas which are contaminated by i