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# During construction of the Quebec Bridge in 1907, the bridge

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During construction of the Quebec Bridge in 1907, the bridge [#permalink]  29 Apr 2005, 04:25
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During construction of the Quebec Bridge in 1907, the bridgeâ€™s designer, Theodore Cooper, received word that the suspended span being built out from the bridgeâ€™s cantilever was deflecting downward by a fraction of an inch. Before he could telegraph to freeze the project, the whole cantilever arm broke off and plunged, along with seven dozens workers, into the St. Lawrence River. It was the worst bridge construction disaster in history. As a direct result of the inquiry that followed, the engineering â€œrules of thumbâ€
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Re: CR - Quebec Bridge [#permalink]  29 Apr 2005, 04:39
A is wrong - "unsafe for public to use" cannot be assumed.
B is wrong - Cooper's abscence cannot be inferred.
C is wrong because nothing leads to inference that analytical menthods were insufficient to solve design problems.
D is correct because 1. Bridges are 1907 are built using analytical methods and they don't collapse. 2. It can be reasonably assumed that because analytical methods are better, they started to be used instead of "inferior" rules-of-thumb.
E. There's nothing that leads to assumption that mathematical analysis was a part of the rules-of-thumbs used for designing bridge before 1907.

Therefore, D.
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E)...

IMO D) is out because it says "only" but maybe there are other factors that could have prevent the disaster. for example a faster communication between theodore cooper and his crew.
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christoph wrote:
E)...

IMO D) is out because it says "only" but maybe there are other factors that could have prevent the disaster. for example a faster communication between theodore cooper and his crew.

I see where are you coming from Christoph. However, there's every reason to assume that after the 1907 incident steps were taken to prevent these things from happening, and what was found lacking was the rigorous mathematical approach, and that was ameliorated. Had a slower communication been the reason for the collapse, we can safely assume that even that would have been taken care of.

Having said that, on second thoughts, E too makes sense.
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IMO its E. D is an extreme statement made. There could be other possible reasons why the bridge would have collapsed. If the engineer would have responded with a telegraph sooner than later, the project could have been freezed and the collapse could have been avoided.

Whats the OA?
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E for me too
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OA is E.
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E because the mathematical concepts incorporated weren`t completely assured....
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I will go with E
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