The engines and machines that turn heat, motion and chemistry into work and back — how each one does it, the cycle it runs on, what it manages to keep of the energy it is given, and what it is made of. Every heat engine here carries its cycle drawn on a p–V diagram: the area inside the loop is the work you get per cycle, and the shape is the whole story.
Nothing in that family yet.
From the Machines database in Notion. Efficiencies are typical for the class of machine, not records. Cycle diagrams are the ideal cycles with textbook parameters — real indicator diagrams are rounder, smaller and less efficient, and each note says what was assumed.