( ( ( manometer ( a device ) ) ( for ( measuring ( gas pressure ) ) ) ) . )
(ROOT (S (VP (VB manometer) (NP (DT a) (NN device)) (PP (IN for) (S (VP (VBG measuring) (NP (NN gas) (NN pressure)))))) (. .)))
manometer a device for measuring gas pressure.
(ROOT (S (NP (NP (DT The) (NN pressure)) (PP (IN of) (NP (NP (DT a) (NN sample)) (PP (IN of) (NP (NN gas)))))) (VP (VBZ is) (VP (VBN measured) (PP (IN with) (NP (DT an) (JJ open-end) (NN manometer))))) (. .)))