Proposal for a New Æther Drift Experiment

Abstract

IT is interesting to learn from L. Essen's communication¹ that the accuracy of measurement of frequencies in the 9,000 Mc./s. region attained at the National Physical Laboratory with existing equipment is high enough for the new æther drift experiment to be carried out. I understand that preparations have been made for the same purpose at the Zeeman Laboratory of the University of Amsterdam by F. Bruin, to whom I suggested the experiment last summer.