Abstract
The creation of a network of magnetic stations at which the vertical magnetic intensity is measured with better precision than can be done with the earth‐inductor would be useful in mineral prospecting and would also be indispensable for unifying the vast amount of observational material gathered by private organizations. This unification would be very valuable to geomagnetic science as well as to the study of large‐scale geological problems. It is estimated that by operating Schmidt balances in groups of three or four instruments and by standardizing them at magnetic observatories every three months, it would be possible to reduce to less than five gammas the contribution of base‐line drifts to the probable error of an absolute determination of the vertical magnetic intensity at field‐stations. The data on which this estimate is based are given in full so as to enable the reader to arrive at his own conclusions.
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