Steam Engine
The Steam Engine is a early game (and pre-polymer) method of turning steam into energy similar to the steam turbine.
Usage
The Steam Engine requires two external sources to provide steam and reprocess the low-pressure steam produced respectively. Using a boiler connected to a Firebox/Heating Oven (or solar boiler) with water inputs will produce the steam required and connecting the Steam Engine to a steam condenser connected into the water loop will allow you to cycle the water indefinitely. The described process would look something like what is pictured here.
Crafting
Crafted in a Tier 2 Anvil: