SERVICE PROJECT NUMBERS 



The projects listed below were transmitted to the Executive Secretary, 

 National Defense Research Committee [NDRC], from the Navy Depart- 

 ment through the Office of Research and Inventions (formerly the Coor- 

 dinator of Research and Development), Navy Department. These are 

 the principal Navy projects relating to the physics of sound in the sea. 



Service Project 



Number Subject 



NO-163 Cooperation with the Navy in harbor surveys 



and surveys of ambient underwater noise 

 conditions in various areas. 



NO-222 Acoustic reflection fields of submarines. 



NS-140 Acoustic properties of the sea bottom. 



NS-140 Range as a function of oceanographic factors. 



(Ext.) 



NS-141 Acoustic properties of wakes. 



558 



