Notes

Abstract

THE Bakerian Lecture will be delivered to-day before the Royal Society by Profs. Rücker, F.R.S., and Thorpe, F.R.S. The subject is the Magnetic Survey of the British Isles for the epoch January 1, 1886, on which these gentlemen have been engaged for five years. They have made observations at more than two hundred stations, and have thus completed the first survey of the United Kingdom in which all three elements—the declination, dip, and horizontal force—have been determined for all parts. In addition to the general survey by means of which the directions of the isogonals, isoclinals, and lines of equal horizontal force have been found, special surveys have been made of selected districts in order to investigate the magnitude, direction, and causes of local magnetic disturbance. The principles which are justified by these inquiries have been applied to the whole country, with results which are likely to prove of interest both to physicists and geologists. We hope to give an account of the lecture in an early number.