Abstract
IN the summer of 1878 the writer began a magnetic survey of the State of Missouri. The work of the first summer was confined to the north-east part of the State, and no points of interest were brought out. During the summer of 1879 the work was extended over the western half of the State, and it was made apparent that diversity of surface exerted a. much more important influence than had been suspected. The lines of equal declination were found to bend very sharply upon entering the large valleys, and the needle showed a tendency to set at right angles to the valleys. This tendency seemed to be greatest when the general direction of the valley made an angle of 45° with the normal position of the needle, or roughly, when the valley runs north-east and south-west, or north-west and south-east. This tendency seems to be inappreciable when the valleys run north and south, or east and west.
Article PDF
Rights and permissions
About this article
Cite this article
NIPHER, F. The Magnetic Survey of Missouri . Nature 23, 583–584 (1881). https://doi.org/10.1038/023583b0
Issue Date:
DOI: https://doi.org/10.1038/023583b0