I always listened to Paul Harvey on the radio. I see these photos and want to know "the rest of the story". Where did it go, what was its job, etc.
Search YouTude for "Paul Harvey The rest of the story" if interested. (in Paul Harvey, not the giant compressor)
I found this, Starting about 2 minutes in explains about a large compressor similar to the one shown.
(I also wish I could figure how to put YouTubes in just as a link)