FIELD: conversion of heat to mechanical energy. SUBSTANCE: engine of piston type with steam drive has several stages and can be designed in the form of single unit. Each stage has its own individual source of steam energy and fluid medium of each stage is different. They have different characteristics of heating temperature so that heat dissipated from one engine can be used to drive next engine. EFFECT: use of inexpensive fuels. 10 cl, 11 dwg
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