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This paragraph removed from the article:
In fluid dynamics, the Brunt-Väisälä frequency is the frequency of vertical inertial oscillations in a stably stratified fluid. (Väisälä obtained this result in 1925 and the English meteorologist Sir David Brunt derived the same result independently in 1927.) However, another source has the co-discoverer of this result as "Vilho Väisälä (1889 – 1969), who was a meteorologist and the inventor of the radiosonde and the founder of Vaisala Group [1] (http://www.vaisala.com/page.asp?Section=43723).
Although one online source identifies the "Vaisala" of the Brunt-Vaisala frequency with Yrjo Vaisala the astronomer, others call him Vilho Vaisala or even Yuri Vaisala and give different years of birth and death. Since Vilho Vaisala was a meteorologist (short bio at http://www.vaisala.com/ ), it seems more likely that he was the person in question rather than Yrjo Vaisala. Apparently Vaisala is not an uncommon last name in Finland.
- Oops, sorry. Thanks for the correction. --Trainspotter 15:20, 17 May 2004 (UTC)