Two gentlemen in France have patented an apparatus that promises to be of much use in economizing the fuel for high pressure engines. The plan consists in conducting the steam, after its action on the piston, into a close vessel, which likewise holds the cold water intended for the boiler : this latter rapidly acquires, by the condensation, a temperature of 98 or 100a centigrade. The water is then conducted into another vessel, in which it deposits the earthy particles and other extraneous substances, that it may contain before entering the boiler. This arrangement presents the advantage of forming much less calcareous deposit, and of not obliging the boilers to be so often cleaned