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Halberton Aqueduct, near Tiverton
Seen from the canal, the aqueduct is as uninteresting as an aqueduct can be. However, seen from below, the work of a draughtsman of remarkable ability is revealed. The canal is carried in a cast iron trough, each span being supported by no less than nine cast iron arches. The thrust from each group of nine arches is transmitted to the brick abutment and central pier via cast iron plates. To the left and right of the iron trough are spans made entirely of masonry. These support the side walls of the iron trough, and also provide for the towpath and a walkway.
To complicate matters, the arches are skewed. The photographs give a hint of the challenge faced by the designer and by the bricklayers. To make life more difficult, the work had to be done in a short timescale, as the canal inevitably had to be out of action for the duration.
The Responsible Engineer was Isambard Kingdom Brunel.
Kerslake of Exeter are credited with producing the cast iron trough. This has been confirmed based on identification of the maker's name on a surface now covered by the butyl lining. Presumably Thomas Kerslake.
Note: Viewing the underside is not to be encouraged, as it requires a descent into the former railway cutting, which may well be privately owned, and there are steep slopes, brambles, and fly-tipped rubbish to contend with.