Equivalent instruments are now being utilized in our national oceano- 

 graphic programs with resolutions, accuracies (and price) from ten to 

 100 times as high, but about the same size. Expendable S.T.D.'s are 

 being developed by several groups, but no obviously superior technique 

 or apparatus has emerged. 



25 



Arthur ZD.3Uttlc.3nr. 



