My thanks go to Henry Bardsley, lead structural engineer on the Pont Simone de Beauvoir, for putting me right on some of the points I made in my article on this bridge earlier on in the week. Since it is not the purpose of this blog to disinform, I will bring these corrections to the fore.

For starters, while the central vesica of the bridge was indeed built on the banks of the Rhine, it was constructed on the west bank and not in Germany but in France. Secondly, the Seine is not tidal in Paris and as such there was no need to wait for low tide in order to fit the barges carrying this central section of the bridge under the low arches of the Pont des Invalides. That is not to say that passing under the arches didn’t present the engineers with any problems. Indeed, Henry writes that ballast was used to not only to balance the barges but also to change their height in the water so that they could carry their cargo high over the seas and low under Paris’s other bridges. The Pont des Invalides was successfully passed but not without a grazing the river bed!

Once again, my thanks to Henry for setting the picture straight!