Detail of injector no. 1 and its igniter, which have also been sectioned.
Referring to the diagram on my info page, it appears that the
liquid oxygen (LOX) enters through the small-diameter tubing at far left. It's
harder to tell from the diagram, but by process of elimination, the liquid
hydrogen must enter through the large-diameter tubing which forms the outer
portion of the injector (the LH2 entering from the bottom).
A picture of where the propellants are injected into the combustion chamber
(from injector no. 2) appears in dsc66784.jpg.