perpetual-motion machine

1. A machine that could run forever. A perpetual-motion machine would have to produce at least as much energy as was needed for its operation. According to the second law of thermodynamics , such a machine is impossible, and to date none has ever been successfully demonstrated.

Example Sentences

I think Ill work on that, instead of my perpetual motion machine after the games.

From Project Gutenberg

How did you become interested in this perpetual motion machine, Miss Laidlaw?

From Project Gutenberg

The mutual motion in coition was one of the reasons for Gilbert's rejection of the perpetual motion machine of Peregrinus.

From Project Gutenberg

This is what a perpetual-motion machine would be if such a machine were possible.

From Project Gutenberg

On a Perpetual Motion Machine, mentioned by authors, by means of the attraction of a loadstone.

From Project Gutenberg