Lake Geneva to swim at some beaches of the lake; indeed, visibility under water was near zero. By the 1980s, intense environmental pollution (eutrophication) had almost wiped out all the fish. Today, pollution levels have been dramatically cut back, and it is again considered safe to swim in the lake. Major leisure activities practiced include sailing, wind surfing, boating (including water skiing and wakeboarding), rowing, scuba diving and bathing. On a scientific footnote, in 1827, Lake Geneva was the site for the first measurement of the speed of sound in (fresh) water. French mathematician Jacques Charles François Sturm and Swiss Physicist Daniel
Geneva Seal are defined according to the NIHS standard 95-11 ( a/k/a ISO 3159) for chronometers. 3 These bulletins are obtained through the Geneva office of COSC. The watches having successfully undergone the rate tests can claim the title chronometer. The regulations on the voluntary inspection of watches from Geneva, of April 5, 1957, is repealed. Apart from the Geneva Seal, some watches carry the name "Geneva" or "Genève" on their dials. The use of the name Geneva on a watch dial is governed by the "Bureau de contrôle des Montres de Genève". To wear this badge, a watch must be a