Tests with wireless d’Asar sound locator device successful according to the Dutch magazine dated Marineblad 1899-1900 no. 5

An item referred to the magazine le Yacht reporting that the tests in the Bay of Genoa with the wireless telephone device of Mario Russa d’Asar were very successful. On a distance of 7 miles was still with accuracy the presence of a ship noticed.(1)

Note
1. Or Dasar, Italian citizen living at Genoa with several patents, including patent US682584 for locating source of sound, published on 10 September 1901.