Abstract
In order to understand the influence of the position of the electrocardiographic electrodes upon the form of the electrocardiogram it is necessary to have some idea of the laws which govern the flow of electric currents in solid conductors.When a constant difference of potential is produced in a thin conducting sheet of infinite extent, the potential (V1) of any point of that sheet is determined according to the following equation: in which Q is the quantity of electricity flowing in unit time, d the thickness of the sheet, k the conductivity of the material of which the sheet is composed, and r1 and r2 the distances of the point from the sink and the source respectively. In dealing with the difference in potential between two points at a given instant the expression may be replaced by k. Thenin which r3 and r4 are the distances of the second point from the sink and source respectively. In the case of a solid conductor a similar expression holds:2in which the letters r1, r2, r3, and r4 have the same signi...
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