( ( ( ( Sound velocity ) ( measured ( on ( parallel ( and ( perpendicular planes ) ) ) ) ) ) ( -LRB- ( ( of ( a ( known distance ) ) ) -RRB- ) ) ) ( ( permits ( determination ( of ( ( wind speed ) ( in ( the ( horizontal direction ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Sound) (NN velocity)) (VP (VBN measured) (PP (IN on) (NP (NN parallel) (CC and) (NN perpendicular) (NNS planes)))) (PRN (-LRB- -LRB-) (PP (IN of) (NP (DT a) (JJ known) (NN distance))) (-RRB- -RRB-))) (VP (VBZ permits) (NP (NP (NN determination)) (PP (IN of) (NP (NP (NN wind) (NN speed)) (PP (IN in) (NP (DT the) (JJ horizontal) (NN direction))))))) (. .)))
Sound velocity measured on parallel and perpendicular planes (of a known distance) permits determination of wind speed in the horizontal direction.
(ROOT (S (NP (NP (NNP Distance)) (PP (IN over) (NP (NP (NN time)) (PP (IN in) (NP (DT a) (VBN given) (NN direction)))))) (VP (VBZ determines) (NP (NN velocity))) (. .)))