Magic lantern slide circa 1880.Victorian/Edwardian.Social History. Slide set: The River Thames: from its head springs to the sea, lecture. Plank Bridge at Cricklade.-Here we see the Thames has more the look of a river as it flows under this curious and simple bridge of wooden planks; this is now the highest part of the river which is reached by boats. Cricklade is an old quiet town, with its principal street very long and broad ; it has two Churches, and a very fine old ancient Cross. The river winds about a good deal after leaving Cricklade