Two years later, on December 8th 1809, they have improved their machine :
“The machine has undergone a lot of changes in many of its parts.The mecanism in the system is more elaborated : its pistons join to the advantage of being more precise, another one that is to create far less resistance.We tested it many times,and the result was that with a drop of 4 feet 4 inches, it lifts to 11 feet the 7 /24 of the water it loses."




The so-called Marly machine


The so-called Marly machine

Carnot answered on December 1809. They had waited too long because the Emperor took himself the decision to ask the engineer Perier (1742-1818) to build a fire machine also known as a steam engine,to operate the pumps at Marly.Comparing it with other projects, Carnot appreciated the Niépce brothers’machine.It seemed to him“ very good“and simpler than the rest.In conclusion, he wrote “It also seems to me that your machine is not over complicated and under all its aspects, it can confirm the idea of your talents that were already given with your fire engine.“