Equipotential Plotting Table

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Abstract
The author has constructed an equipotential plotting equipment of the same principle as used by Murray and Hollway [J. Appl. Phys. 24, 110 (1953)]. The electrolytic field of an ordinary paper with electrodes painted upon it with graphite dispersion is mapped with a probe. The electrodes are fed with dc of 1000 volts. Due to the high resistivity of the paper (about 104 megohms/sq), polarization is of no importance. The position of a desired equipotential line can be found easily with an accuracy of 0.1 mm at an interelectrode space of about 300 mm. The papers used have proved to have some undesirable qualities that decrease the accuracy unless special precautions are made. The most important errors are the variations of the paper thickness across the surface and the nonisotropic conductivity of some kinds of paper. When measuring currents (the analog for flux) it was necessary to avoid errors caused by the great change of conductivity of the paper at different atmospheric humidity. Normal variations of the humidity proved to change the conductivity by a factor of four.

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