At the MAE we obtained an announcement of the Rex-Simplex engine that is mentioned in the main text, without illustration.

“Rex-Simplex aero engine ad”

-As we can see, it is a water-cooled, upright, in-line, six-cylinder engine.

-The shape of the oil sump calls our attention. It has a very pronounced slope.

-It is supposed to be adapted to the design of certain aircraft.