Abstract: An equation is developed, to show the magnitude of pressure change required to produce a given amplitude for a given period on the galvanometric record of the Macelwane electromagnetic microbarograph. The simultaneous ...

Abstract: Micro-oscillations in the atmosphere of the order of magnitude of minutes have been known and studied for many years. In 1936 Macelwane, and in 1939 Benioff, with their respective electromagnetic microbarographs showed ...