The Mariner's Compass in an Iron Ship - How to Keep It Efficient, and Use It Intelligently, With Some Remarks on Electric Installation in Its Relation to the Compass #249052

The late Sir Edward Sabine also writes: All attempts that have hitherto been made to connect the secular mag netic change with any other physical phenomena, either terrestrial or cosmical, have signally failed. Magnetism. — Certain substances, natural or artificial, have the power Of attracting iron, and are popularly known as magnets, the cause of this attraction is called magnetism.