CONFIDENTIAL REPORT 2G-21
S19
     
 
FORMER GERMAN SUBMARINE TYPE XXI
 
 
 
 
PERSERVATIVE COATINGS
 
 
 
 
SUMMARY
  
     
          Protective coating is in general the same in character as that on earlier vessel types.  In order to conserve critical material, however, galvanized material is authorized in lieu of primary corrosion resisting material, and on certain cases black bolts, white-leaded, are authorized as an alternative to galvanized bolts.  
          The camouflage coating of this type of vessel is light gray in place of the previous black standard.  
     
     
     
     
     
     
 
March, 1946
 
 
 
 
PORTSMOUTH NAVAL SHIPYARD, PORTSMOUTH, N. H.