Yes top picture is a steam engine. The device at the very top, with 2 balls is a govenor. It controls the amount of steam fed to the engine to keep the speed more or less constant. As the engine speed increases the balls move out through centrfugal force and close the steam valve. As it slows down the reverse happens & it opens the steam valve. It looks as though there are a few bits missing though, as there should be a drive to the govener from somewhere, possibly a pulley on the main shaft. It is sitting on the main steam valve which is on the valve chest next to the cylinder. The other object on the cylinder (to the left) is a lubricator for lubricating the cylinder & valve chest. :smartass: