Hall-Rees and Davis Escape Apparatus


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 Hall-Rees and Davis Escape Apparatus

Date: 03 December 2002


JW. Bech


Siebe Gorman &Co. Ltd.



Hall-Rees-Davis escape app.


Land of origin



Special Note: 

Oxilithe equipment


User group



Part no:



Working principle

Chemical reaction


Gas type



Cylinder volume



Max. cylinder pressure



Material of cylinder



Counterlung inspire



Counterlung exhale



Dive time duration



Operating temperature



Magnetic signature



Weight ready to use in Air



Weight ready to use in water






Scrubber material










In the suit with helmet

Scrubber on the chest


In helmet

















If you have any information to add this sheet please mail it to jw.bech@quicknet.nl References to source and names will always be added!  


Info found:


Origin: http://www.therebreathersite.nl


Info: In 1904 Siebe, Gorman & Co. Ltd acquired the rights in “ Oxilithe “, a special preparation of sodium peroxide invented originally by the French savant, Professor Georges Jaubert. This chemical, when breathed upon, gives off oxygen and at the same time absorbs the carbon dioxide of the expired air. In 1907 two British naval officers, Captain (afterwards Admiral) S.S. Hall, C.B.E, and Fleet-Surgeon O. Rees,M.D., in collaboration with Robert H. Davis, designed the apparatus as shown on the picture page with all the components internal, in outward form like the original Siebe open helmet, or hood, and jacket, and in which “Oxilithe” in a metal container was employed as the air regeneration medium. The fact that Oxylithe dispensed with the use of compressed oxygen for the main supply of this gas probably influenced the authorities in adopting the apparatus, and it was installed in submarines of the British Navy, and, to a smaller extent, in those of several other navies. It will be seen that the jacket is fitted with two small cylinders of compressed air or oxygen- the larger for keeping the water inside the hood to a certain safe level, the smaller for inflating a buoyancy chamber inside the jacket when the wearer reached the surface, so that he could safely open the window of his helmet and breathe fresh air without risk of sinking. The original apparatus had a flexible hood, but it was feared that the escapee arriving at high speed at the surface might come in contact with some obstacle and injure his head; it was therefore decided to substitute the metal headpiece.






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