( This ( ( produced ( ( ( a ( plano-convex lens ) ) , ) ( where ( Dagron ( was ( able ( to ( ( mount ( the ( microscopic photograph ) ) ) ( on ( ( the ( flat side ) ) ( of ( ( the lens ) ( using ( ( Canada balsam ) ( as adhesive ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBD produced) (NP (NP (DT a) (JJ plano-convex) (NN lens)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NNP Dagron)) (VP (VBD was) (ADJP (JJ able) (S (VP (TO to) (VP (VB mount) (NP (DT the) (JJ microscopic) (NN photograph)) (PP (IN on) (NP (NP (DT the) (JJ flat) (NN side)) (PP (IN of) (NP (NP (DT the) (NN lens)) (VP (VBG using) (NP (NP (NNP Canada) (NNP balsam)) (PP (IN as) (NP (NN adhesive)))))))))))))))))) (. .)))
This produced a plano-convex lens, where Dagron was able to mount the microscopic photograph on the flat side of the lens using Canada balsam as adhesive.
(ROOT (S (NP (DT The) (ADJP (RBS most) (JJ common)) (JJ two-lens) (NN telescope)) (, ,) (PP (IN like) (NP (DT the) (JJ simple) (NN microscope))) (, ,) (VP (VBZ uses) (NP (NN convex) (NNS lenses))) (. .)))