( ( ( ( ( ( J&uuml;rgen Geiger ) , ) ( son ( of ( ( Hans ( Geiger inventor ) ) ( of ( the ( Geiger counter ) ) ) ) ) ) ) , ) ( ( an instrument ) ( to ( measure radioactivity ) ) ) ) . )
(ROOT (NP (NP (NNP J&uuml;rgen) (NNP Geiger)) (, ,) (NP (NP (NN son)) (PP (IN of) (NP (NP (NNP Hans) (NNP Geiger) (NN inventor)) (PP (IN of) (NP (DT the) (NNP Geiger) (NN counter)))))) (, ,) (NP (NP (DT an) (NN instrument)) (PP (TO to) (NP (NN measure) (NN radioactivity)))) (. .)))
J&uuml;rgen Geiger, son of Hans Geiger inventor of the Geiger counter, an instrument to measure radioactivity.
(ROOT (S (NP (NP (DT The) (`` `) (NN counting) ('' ') (NN instrument)) (NP (NN geiger) (NN counter))) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN radioactivity))))))) (. .)))