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Unclassified 



) READ INSTRUCTIONS 



' BEFORE COMP1.ETINC. FORM 



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CIVIL ENGINEERING LABORATORY 

 Naval Construction Battalion Center 

 Port Hueneme, California 93043 



Naval Sea Systems Command 

 Washington, D.C. 20362 



10. PfiOC^ 



63713NiS46ii9{ 

 1620aM43-of5 



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15. SECURITY CLASS, fof I 



Unclassified 



IS*. DECLASSlFlC* 



16. DlSTRie 



Approved for public release; distribution unlimited. 



I STATEMENT (oi 



SUPPLEMENT* 



19. KEY WORDS fCoi 



Diver-heating, electrochemical heat source, magnesium-seawater reaction, 

 powdered metal electrochemical cell, human factors. 



20 ABST^A.CT fCon.l^. on ■•*«■• ••<•' » ».«"~X "» — ' "' 



Free-swimming divers working in cold water for extended periods of time require a 

 self-contained, active heat source to maintain their physiological thermal equilibrium. 

 Previously, the accelerated reaction of magnesium with seawater was shown to be a 

 suitable heat source for diving applications. The magnesium heat cell was configured as a 

 short-circuited battery with alternate electrodes of magnesium and steel spaced 

 closely together; the unit is activated by immersion in a seawater electrolyte. An — - 



DD 



1473 EDITION 



I NOV 65 15 OBSOLETE 



Unclassified 



SECURITY CL 



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