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The Humber Bridge

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Revision as of 22:14, 22 February 2017 by Tom Bishop (talk | contribs)

Q. If the earth is flat, why do top of the pylons of the Humber Bridge deviate in distance by 36mm compared to the bottom of the pylons?
A. The pylons were built vertically in relation to the earth. The pylons were built to be exactly the same height. The difference in distance at the top of the pylons is only a theoretical figure for what the difference should be if the earth were a globe.

No physical measurement in heights was ever performed or detected on this or any other bridge. Forum user "Niceguybut" once tried to champion the cause that there was a physical, detected difference on the Humber Bridge. Here were his results:


Niceguybut wrote:


"I once tried to champion this cause, and in the interests of getting a definitive answer, I emailed the Humber Bridge Authority to ask whether the figure was measured or purely theoretical. Here's the reply:


Thank you for your recent email.

The two towers are build vertical to a tangent to the earth, i.e. radial to the centre of the earth, thus, theoretically, the shape between the two towers is an inverted trapesium rather than a rectangle with the length between the bottom of the towers being 36mm less than the length at the top of the towers.

The gap at the base is, of course, the one that was actually "measured" with the apparent increase being a result of building the towers "vertically".

Regards

Peter Hill General Manager & Bridgemaster


So there you have it, straight from the horse's bridgemaster's mouth. I'm man enough to admit I backed a wrong 'un, so can we let this one go now?"