Magnetical Instructions For The Use Of Portable Instruments Adapted For Magnetical Suverys And Portable Observatories And For The Use Of A Set Of Small Instruments Adapted For A Fixed Magnetical Observatory

Excerpt from Magnetical Instructions: For the Use of Portable Instruments Adapted for Magnetic Surveys and Portable Observatories, and for the Use of a Set of Small Instruments Adapted for a Fixed Magnetical Observatory; With Forms for the Registry of Magnetical and Meteorological Obervations The elements on which the determination of the Earth's Magnetic force is usually based, are the declination, the inclination or dip, and the intensity the declination is the angle which the magnetic axis of a freely suspended magnet, or the line of the magnetic meridian, makes with the true or astronomical meridian the inclination is the angle by which one of the extremities of a dipping needle, or magnet freely suspended by its centre of gravity, dips below the horizon; the intensity is the force exerted on a dipping needle (or magnet so suspended) to retain it in its position of equilibrium, or the power with which, when withdrawn from this position, it tends to revert to it. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.