South bridge is just one span of a viaduct which is only exposed where it crosses the Cowgate. There is a central arch which is presumably original, with a matching strip on one side and a rather different section added at the other. Lots of cracks and movement to explore.
I had no idea there were two Alcantaras. al-QanTarah (القنطرة) means "the bridge", says Wikipedia, which explains that. Many more then I guess but these both cross the Tagus. The other is more famous, possibly for good reason but this was well worth a visit.
I find Edinburgh endlessly fascinating. When I lived in Dundee it was a place for an excursion. From Exeter it is a rather harder journey, but I was there for a Future of Design Conference in April and took the chance to look again at the bridges over Cowgate, south of the old High Street. I did some work on South Bridge back in the early 90s and that will (probably) feature next month. It has 17 spans. How many spans there really are in George IV Bridge I don’t know but it is, in any case, a very different bridge.
I have been wanting to get some decent pictures of William Edward’s bridge in Pontipridd for some time (years). March provided an opportunity but it was cold and wet and the pictures weren’t that good so try again. What I did find, though, was this amazing effort from IKB. Can it be chance that it is the same span?
This month we look at a small private bridge across the Tamar in North Devon and Cornwall.
The railway viaduct at Castle Garth in Newcastle was constructed on centres built with 12 inch boards. The gaps between boards would have coincided with joints between brick courses, allowing the mortar to fall out. A possible explanation for ring separation in brick arches?
A scheduled monument dated to the second quarter of the 18th Century, this badly deformed bridge crosses Afon Mawddach on the southern exit from Llanelltyd. Formerly carrying the A470, it has been bypassed by a modern bridge which will surely be gone long before this one.