Hero’s Engine, Bladeless Radial Steam Turbine
Puzzle 20 of The 1950s Hard Pack
Question is: Hero’s Engine, Bladeless Radial Steam Turbine
and the answer is: AEOLIPILE
Word Meaning:
AEOLIPILE — A steam engine powered by rocket propulsion due to escaping steam, consisting of a pressure vessel mounted on a bearing, with one or more tubes which exhaust steam tangentially to the rotation axis so as to create rotation.
Definitions from Wiktionary.