Discussion of paper by A. R. Clark entitled 'The Determination of the Long Dimension of Conducting Ore Bodies'
| Autor: | Bruno F. J. Kunz |
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| Rok vydání: | 1956 |
| Předmět: | |
| Zdroj: | GEOPHYSICS. 21:477-478 |
| ISSN: | 1942-2156 0016-8033 |
| DOI: | 10.1190/1.1486576 |
| Popis: | When J. N. Hummel published his first apparent resistivity curves some 30 years ago, he used coordinates with a linear scale. A short time later it was found that such master curves are universally usable only when plotted on logarithmic scales. The reason for this is that the shape of the curves does not depend upon the absolute electrode spacing and the absolute resistivity values but only on the relative values. This, naturally, also holds true for the examples shown by A. R. Clark. The curves as shown by him reveal a resistivity ratio of [Formula: see text]. In the same way, the “Distance as a fraction of the Semimajor Axis” is a quotient. Both coordinates should therefore be presented in a logarithmic scale. When so plotted, the characteristic properties of the curves are much more conspciuous and are very different from those when linear scales are used. The remarks made by the author relative to the shape of the curves may have to be revised. |
| Databáze: | OpenAIRE |
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