float was completely stripped of paint, carefully inspected, 

 and then coated with Demetcoat paint in the interior and 

 Laminar polyurethane paint on the exterior. These coatings 

 were chosen to provide maximum protection of the metal 

 surfaces of the float. In addition to renovation most of 

 the metric standard hardware and fittings were replaced 

 by U. S. standard material for ease of maintenance. 



10. CATHODIC PROTECTION 



The cathodic protection system installed on the float 

 was modified slightly by the substitution of an improved 

 control box topside. The original control box proved 

 unsatisfactory, as the inert fluid within it was lost several 

 times during operations owing to poor construction. The 

 new control box is a completely sealed unit containing a 

 flexible diaphragm for pressure compensation. In addition, 

 the circuit wiring was revised to provide better control of 

 the system. 



11. VERTICAL SPEED 



The original vertical speed transmitter was inopera- 

 tive more often than not. The unit was completely re- 

 designed, but using the same basic principle. The rede- 

 signed unit has performed very well so far. 



12. AIR BALLAST BLOW SYSTEM 



The air ballast blow system used to blow the end tanks 

 and the antechamber subsequent to the dive was badly 

 deteriorated. Therefore, all the piping was replaced with 

 stainless steel piping, and a better type control valve sys- 

 tem was installed. 



13. HULL CONNNECTORS 



The hull connectors that were constructed for the Terni 

 sphere, while actually new assemblies, were of the same 

 design as the original Piccard hull connectors. The 



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