HAYES— DETECTION OF SUBMARINES. 



45 



poses it is sufficiently accurate to be helpful in making an approach. 

 Plate XVIII. shows the range chart used in connection with this 

 type of installation. Range curves are plotted in terms of the an- 

 gular bearings on the two installations. As an example, suppose the 



Plate XVIII. Range chart — computed for two detectors with base Hne of 



550 feet. 



bearing of the submarine as given by the eels and the " on-board " 

 lines are 43 degrees and 120 degrees respectively. The range of the 

 submarine would be 125 yards. 



The development of the principle of electrical compensation has 

 made possible the use of long lines containing many receivers so it 

 would seem that the limiting possibilities of the submarine sound 

 detector have by no means been reached. In fact the usefulness of 



