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Hello, Plücker got the chair for physics at Bonn in 1835 1836. But as a mathematician his main focus was math. This changed in 1847, when he got tired for his not too good reputation in German math. From 1847 on, his main focus was physics. All this is stated in much greater detail in s:de:ADB:Plücker, Julius (in German, I'm afraid). Rgds --Boobarkee (talk) 00:03, 22 August 2009 (UTC) Correction to 1836 Boobarkee (talk) 10:15, 22 August 2009 (UTC)
The phrase "the three lines in the hydrogen spectrum" seems to be a mistake. There are four visible lines in the same. Plucker might have genuinely believed that there were three. —Preceding unsigned comment added by 22.214.171.124 (talk) 13:58, 10 February 2011 (UTC) See Hydrogen spectral series.