Abstract
UP to this point we have regarded the system of magnetic forces in play upon the surface of the earth as constant. I have already hinted that this is not the case, and that the difficulties of our investigation are immensely increased by the fact that all the phenomena with which we deal are in a state of flux. Nothing is fixed from year to year, from day to day, from hour to hour. It is hardly too much to say that at times almost every minute brings with it changes which it is the business of the magnetician to investigate and explain. For the moment, however, I wish to fix attention only upon the secular change to which I have already referred. Not only does the angle which the magnet makes with the geographical meridian vary, but the dip also increases and diminishes in turn.
Article PDF
Rights and permissions
About this article
Cite this article
Recent Researches on Terrestrial Magnetism1 II.. Nature 57, 180–184 (1897). https://doi.org/10.1038/057180b0
Issue Date:
DOI: https://doi.org/10.1038/057180b0