XEE4139933 Sound energy: speed of sound in water. Experience of 1826-1827 by Jean Daniel (Jean-Daniel) Colladon (1802-1893) and Charles Francois Sturm (1803-1855) on Lake Geneva (Leman Lake). Two boats moored 14 km apart, one of the boats supported a bell, a hammer hitting the bell lit a pile of powder. The second boat was fixed an acoustic cone whose flag closed by a membrane plunged into the water. Anonymous illustration from 1925. Private collection. by Anonymous; Private Collection; (add.info.: Sound energy: speed of sound in water. Experience of 1826-1827 by Jean Daniel (Jean-Daniel) Colladon (1802-1893) and Charles Francois Sturm (1803-1855) on Lake Geneva (Leman Lake). Two boats moored 14 km apart, one of the boats supported a bell, a hammer hitting the bell lit a pile of powder. The second boat was fixed an acoustic cone whose flag closed by a membrane plunged into the water. Anonymous illustration from 1925. Private collection.); Stefano Bianchetti; out of copyright.