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Navier is a professionally trained engineer. Finley was an independent entrepreneur hoping to earn profit, Navier was a salaried employee in French

His first major suspension bridge was completed in britain. Name of bridge was union bridge which is already designed by samuel brown and constructed between august 1819 and july 1820.

As you can notice at the union bridge, navier is effected by english civil engineers. British engineers were occupied to cable design problems. But they were not studying on mathematical techniques of tension and load.
For example Telford, who is the designer of union bridge, did not use mathematical techniques to determine cable tension.

Navier has collected this information from British engineers and than distributed all over the French. But another important issue here is what he did not do with the information he has gathered.