A test of the electromagnetic theory of the hydrogen vortices surrounding sun-spots

The extensive fields of force shown by the spectroheliograph in the hydrogen atmosphere surrounding sun-spots have been explained in two different ways: (1) as true hydrodynamical vortices, resembling great tornadoes, and (2) as electromagnetic phenomena, in which charged particles moving in the solar atmosphere are constrained by the magnetic fields in the spots to follow their lines of force. The principles involved in the electromagnetic theory have been applied to the explanation of the terrestrial aurora by Stormer, who has also developed this theory for the case of sun-spots.(1

Survey of Vapor Phase Chemical Agents for Combustion Suppression

Literature survey of vapor phase chemical agents for combustion suppressio

Lunar photography with the Hooker Telescope

My justification for contributing to this symposium is certainly not that of special knowledge. I cannot pretend to have made any serious study of the Moon, and therefore my comments on lunar research are entitled to but little weight. But I could not forego the privilege of joining in this tribute of admiration and respect for the work of my friend Professor Brown, whose fundamental investigations on the motion of the Moon have so richly deserved the award of the Bruce Medal