In 1949 this university designed a rocket engine.

-It delivered 100 lbf (445 newtons) of thrust, and ran on liquid hydrogen and oxygen. Below we see it in a diagram and running in a photograph already in 1949.

"Ohio University Engine Schematic"

-It is called regenerative as a propellant circulates through an outer jacket that cools the nozzle.

“Above mentioned engine running”

-The "diamonds" characteristic is produced by shock waves. It is currently seen in powerful combat turbojets when afterburning comes in.