| Description | Tables of magnetic observations, with magnetic declination, magnetic intensity, and magnetic inclination [or dip]. From April 1840, meteorological information accompanies the magnetic data.
The Royal Society's interest in magnetic observations at this period was in response to a letter by Alexander von Humboldt, 23 April 1836, to William Parsons, 3rd Earl of Rosse and President of the Royal Society, proposing an international network of observatories [AP/20/7]. |