This bridge was designed by William Etheridge and built by James Essex in 1749 and it has been rebuilt in 1866 and 1905. It is composed of straight timbers in a very curious design and this is the reason because it is called “mathemtical”.
A tale says that Newton was able to build one mathematical bridge with straight timbers without the use of bolts but I think this is not really true.
Location: the Mathematical Brisge (map)