Steam engine

A steam engine was a piece of human technology, a heat engine that performed mechanical work using steam as its working fluid.

Merlin Athrawes simulated the heat signatures of steam engines on the Castaway Islands in order to find out if the kinetic weapon platforms in orbit of the planet Safehold would be triggered by them. When nothing happened, he was hopeful to soon introduce them to the Empire of Charis. 

By April of the Year of God 896, Ehdwyrd Howsmyn and his engineers were in the process of testing the first Charisian-built triple-expansion steam engine.