perpetual-motion

The second idea was for a perpetual-motion machine.
La deuxième idée était pour une machine à mouvement perpétuel.
Even with pollution-free perpetual-motion engines there will be unwelcome environmental consequences.
Même avec des moteurs à mouvement perpétuel et non polluants, il y aura des effets indésirables sur l’environnement.
He spent most of his time in his workshop, where he made perpetual-motion machines, dutch clocks and other mechanical movements.
Il passait la plupart de son temps dans son atelier où il fabriquait tout le temps de meubles, des pendules à coucous et d’autres dispositifs mécaniques.
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