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Finley’s vs. Navier’s Bridges
Finley has a constant sag/span ratio.
Navier has adopted this ratio
Effect of environment on scientists
Having a constant sag/span ratio simplifies the calculations but sacrifies the stability. Finley’s tower design makes it simple to build but it limits the length of span that could be built. Finley’s design has only one link between hangers, which saves iron and makes the structure cheaper, it forces to design two types of keys to connect hangers to the cables.
Navier’s adoption makes design more stable. He has sacrificed the economy and ease of construction. It requires more skilled labor in the design phase of construction.
Finley and Navier attempted to structure their research and design efforts in the relation to their environments.