The Ancient Greeks Had a Steam-Powered Device

Long before the first steam locomotive, a brilliant Greek engineer and mathematician in Roman Egypt demonstrated the power of steam. Hero of Alexandria, teaching in the great (Review) library's city, created a device called the aeolipile. It consisted of a hollow sphere mounted on pipes connected to a heated cauldron of water. As the water boiled, steam traveled up the pipes and into the sphere, escaping through two bent nozzles on its sides. This expulsion of steam created thrust, causing the sphere to spin rapidly, a clear demonstration of the principle of action and reaction that would be formalized by Newton many centuries later.

Despite this remarkable display of steam power, the aeolipile was never used for practical labor. Historians believe it was treated as a fascinating novelty, a "temple wonder" to inspire awe, or a teaching tool to demonstrate scientific principles. The ancient world had other power sources like watermills and animal or human labor, and there wasn't the same industrial demand that later drove the development of engines for mining and transport. The aeolipile is considered the first recorded steam engine, but it remained a curiosity, a tantalizing glimpse of a technological revolution that would not arrive for nearly two thousand years.