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View through the openings in the exhaust manifold to the tubes comprising the thrust chamber.

Picture 2 of 2.

Note the beginning of the gaps between the regenerative cooling tubes. These both admit turbine exhast gases into the thrust chamber and provide space for the half-length "down" tubes from the fuel manifold.

 
Interior of J-2 Engine Thrust Chamber J-2111 LOX turbopump turbine exhaust manifold inlet, including regenerative cooling tube cat eyes at Marshall Space Flight Center
Time picture taken Mon Sep 9 13:24:52 2013
Location picture taken Building 4205
Marshall Space Flight Center
Huntsville, AL
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