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Technique nouvelle de modèles réduits pour la prospection électriqueNormal access

Authors: L. Cagniard and R. N. Neale
Journal name: Geophysical Prospecting
Issue: Vol 5, No 3, September 1957 pp. 259 - 271
DOI: 10.1111/j.1365-2478.1957.tb01432.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 1.47Mb )

Summary:
The use of small scale models in the interpretation of results of electric prospecting involves two majors difficulties: (1) the dimensions of the models and of the tanks in which the experiment is performed must be of unwieldy large sizes if one wants to be quite free from side effects; (2) the precise geometrical relation, in respect to the model, of the successive points where the interesting data are measured, requires an intricate installation, and is costly in both time and money.

The technique which is described in this paper eliminates these difficulties as well as some others. The surface of the ground is represented by the lower face of a thick horizontal plate of plexiglas which is laid at the surface of the liquid filling the tank. This plate is pierced by a great number of small holes whose coordinates have been measured initially with the necessary precision. The electrodes are then introduced into these holes without creating any perturbation in the distribution of the lines of current flow. A solution of copper sulphate is used as the liquid in conjunction with copper electrodes. In this way, a D.C. excitation is possible, combining precision with convenience.


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