Before we head on to visit the show itself, let's take a peek at the controls for the Carousel of Progress.
Each of the six theaters had one of these stations on the left side. A colorfully dressed hostess, with white gloves no less, was stationed there to make sure everyone stayed in their seats. With the audience safely seated, she would push a button signifying that the ride could proceed. Unless all of the theaters were ready the theaters didn't rotate.
The controls also include a public address system and an intercom to the folks working outside.