Terrestrial Magnetism in France

Abstract

THE work referred to below x contains in twelve pages summaries of seismological and meteorological results at Pare St. Maur from 1915 to 1922. The remainder of the volume is devoted to terrestrial magnetism. The longest single article is one by the late M. C. Dufour, discusskig the magnetic records of 1922 at the Observatory of Val Joyeux, of which he was in charge. M. Dufour's death in August 1923 is recorded with regret. Hourly values at Val Joyeux are confined to 6 h., 12 h., 18 h., and 24 h., except on the international quiet days, when all hours are included. The daily mean from the whole 24 hours and the general character are given, however, for each day. From 1921 to 1922 westerly declination, inclination, horizontal force, and vertical force all fell by 117 1, 0-4, 97, and 317 respectively.