it was necessary to utilize 'Pyrotenax' cables of an external diameter of 

 •59 to -63 in. and containing one to three copper cores. Fig. 23 shows 

 the construction of these passages. As it would have been difficult to 



Fig. 23. Passage of a large electric cable through the cabin wall 



seal them directly into the cabin, we sealed them in tubular plugs 

 placed in the holes in the cabin/! Between the plugs and the cabin the 

 watertightness was achieved by means of a plexiglas ferrule e against 



