Injector with Spark Plug Igniter, Rocket, R.H. Goddard

Disc with equidistant holes around face; square, bolt-like projection on one side, with spark plug projecting at right angle from one facing of this square; equidistant fine injector holes seen at bottom of disc; these holes penetrate to opposite side of disc; copper colored funnel-like insert on other side of disc, through which one can see the spark plug igniter tip