When I was in my teens, we used to notice how an engine ran better on a foggy night so we used to put a water soaked hessian bag around the air intake so that the air was very humid. That is pretty much the same thing as this clip shows. Not that we were anywhere near the first to do that. The father of my friend who did this with me said that those things were done before WWI.
Not very remarkable, if you ask me.