Check the listing for details. Gustave Ferrié & Jules Carpentier Galvanometer Wavelength Counter TSF.. Condition: Used, Made in France. Listed at 3074.14 USD. After the invention of the telegraph and the first tests of Marconi, Gustave Ferrie, then captain of the engineering in the service of the military telegraph, was mandated by the Minister of War, Freycinet, to continue to experiment more and do more studies in the implantation in France of a material which would make military importance of first class. To achieve these successes, Gustave Ferrie has requested collaboration as a manufacturer Jules Carpentier. They studied the construction of new bases of induction coil and switches to mercury specially designed for TSF, and quickly set up complete electrical equipment for the production of radio waves to download powerful capacitors at age. Jules Carpentier, still in collaboration with Gustave Ferrie, has also created the wave meter, frequen.