Articles EARTH CURRENTS AND MAGNETIC VARIATIONS By Fernando Sanford See allHide authors and affiliations Science 27 Oct 1922:Vol. 56, Issue 1452, pp. 464-468DOI: 10.1126/science.56.1452.464 Fernando Sanford Find this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.