The well-known discussion on an engine consisting of a ratchet and a pawl in [R. P. Feynman, R. B. Leighton, and M. Sands, The Feynman Lectures on Physics (Addison-Wesley, Reading, MA, 1953), Vol. 1, pp. 46.1-46.9] is shown to contain some misguided aspects: Since the engine is simultaneously in contact with reservoirs at different temperatures, it can never work in a reversible way. As a consequence, the engine can never achieve the efficiency of a Carnot cycle, not even in the limit of zero power (infinitely slow motion), in contradiction with the conclusion reached in the Lectures. (C) 1996 American Association of Physics Teachers. [References: 11]
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机译：[R. P. Feynman，R。B. Leighton和M. Sands，《费曼物理学讲座》（Addison-Wesley，雷丁，MA，1953年），第1卷。 [第1页，第46.1-46.9页]显示了一些误导的方面：由于发动机在不同温度下同时与油箱接触，因此永远无法以可逆方式工作。结果，与讲座中得出的结论相矛盾，即使在零功率的极限（无限慢动作）中，发动机也永远无法达到卡诺循环的效率。 （C）1996年美国物理教师协会。 [参考：11]
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