The visualisation below of how the Pontcysyllte Aqueduct (only 9 of the 18 arches are shown above) was constructed has been completed by See3D for the Royal Commision on the Ancient and Historical Monuments of Wales. My thanks to for the embedded code to enable the showing below – fascinating and very clever by Thomas Telford and William Jessop.

More photos.

More detail of the aqueduct.

Pontcysyllte Aqueduct Visualisation – See3D from See3D Animation on Vimeo.