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How to bring down a ginormous bridge by spitting


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I read in the paper that the Howrah Brigdge in Kolkata (Calcutta) which spans the mighty Hooghly River is at risk of failure from corrosion. While the metal cantilever structure was designed to withstand nearly anything, the engineers missed one possibility ... that the hordes of people crossing it daily would spit on it. And it wouldn't be just regular spit ... but spit with betel nut, powdered lime (the calcium compound), tannin and compound etc which becomes an acidic cocktail.

Always gotta expect the unexpected!

Posted by alexchan 17:00 Archived in Malaysia

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