A DiAEXXIAL KkC'OHI) Mi7 



auspices continued throughout the war. A special board of the navy 

 was formed to deal with anti-submarine devices, and under their direc- 

 tion rapid experiments developed, with the training of physicists and 

 the installation of devices. 



I liave a few slides illustrating this work whicli we will go througli 

 and I will attempt to describe, without going into technical detail, some 

 of tlie features of the work. 



(The remainder of ]\Ir. ^Mason's speech was descriptive of the 

 slides.) 



