The design of the Mackinac Bridge was directly influenced by the catastrophic failure of the first Tacoma Narrows Bridge in 1940 due to instability in high winds. Three years after that disaster, Steinman had published a theoretical analysis of suspension bridge stability problems which recommended that future bridge designs include deep stiffening trusses to support the bridge deck and an open-grid roadway to reduce its wind resistance. Both of these features were incorporated into the Mackinac Bridge. (from Wikipedia)
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Mackinac Bridge
Price: $3.50
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About the Card
- Printed on heavy Epson photo paper with rich, color corrected archival inks and overlaid on 80 pound card stock.
- 5-1/2" x 4-1/4" (140mm x 108mm) in size.
- Comes with a matching envelope.
- May be purchased individually or in sets.
- Personalized messages available upon special request.
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