( ( ( ( ( ( ( Galvanometer , ) ( permanent ( bar magnet ) ) ) , ) compass ) , ) ( ( ( ( ( ( two ( solenoid coils ) ) ( -LRB- ( ( ( coarse and ) fine ) -RRB- ) ) ) , ) ( ( ( ( iron rod ) , ) ( aluminum rod ) ) , ) ) and ) battery ) ) . )
(ROOT (NP (NP (NNP Galvanometer)) (, ,) (NP (JJ permanent) (NN bar) (NN magnet)) (, ,) (NP (NNS compass)) (, ,) (NP (NP (NP (CD two) (JJ solenoid) (NNS coils)) (PRN (-LRB- -LRB-) (NP (JJ coarse) (CC and) (JJ fine)) (-RRB- -RRB-))) (, ,) (NP (NP (NN iron) (NN rod)) (, ,) (NP (NN aluminum) (NN rod)) (, ,)) (CC and) (NP (NN battery))) (. .)))
Galvanometer, permanent bar magnet, compass, two solenoid coils (coarse and fine), iron rod, aluminum rod, and battery.
(ROOT (S (NP (DT An) (NN electormagnet)) (VP (VBZ is) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NP (NN iron)) (PP (IN inside) (NP (DT a) (NN solenoid))))))) (. .)))