Exhaust Steam Injectors

Does anyone have any good resources for Elesco Exhaust Steam injectors? I was reading in one of my books on steam locomotive's and I came across this style of injector. It has peaked my intrest as I do not believe they were very popular. I believe they were used on the OC #6325 and the BLE texans. However, I have not been able to find any real information outside of theory as per construction and detail.

Well,
I do not know the design of US exhaust steam injectors, but they will not realy be different from those the european, especially austrian and czechoslovakian railways used....

What are you looking for? And eyplaination how it worked?