Mariner's Compass in an Iron Ship

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. 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.