Abstract
IT is a regrettable fact that some of our scientific activities have required the stimulus of war to initiate them and the fear of war to keep them alive. Not the least striking example of this impingement of military necessity on scientific research is afforded by the subject of direction finding by sound. During the Great War, sound provided the only means of locating the submarine that threatened our shipping, mining operations that threatened our entrenchments, the distant and invisible gun and the aeroplane flying behind cloud or in the darkness; and this search by sound provided four widely differing methods all requiring advanced scientific technique. The subject is so large that I am proposing to confine myself to the operation of finding the direction of sound transmitted through the air.
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