Until modern times the city was built largely on floating pontoons or on piles at the edges of the innumerable canals and water-courses which formed the thoroughfares, but to meet the requirements of modern life, well-planned roads and streets have been constructed in all directions, crossing the old canals at many points and lined with well-built houses, for the most part of brick, in which the greater part of the erstwhile riparian population now resides.
A battle was fought on the Canal banks, and some Turkish detachments succeeded in launching pontoons on the Canal itself.
" Floating " bridges are roadways carried on pontoons moored in a stream.
(5) Floating Bridges, the roadway being carried on z pontoons moored in the% stream.
In length, each supported by two pontoons placed 64 ft.
The pontoons are of iron, 852 ft.
(2) The Britannia and Conway bridges were built on staging on shore, lifted by pontoons, floated out to their position between the piers, and lastly lifted into place by hydraulic presses.
The rapidity with which walls, piles and pontoons - stone, wood and iron - become covered with marine plants is well known, while the discovery of some effective means of preventing the fouling of the bottoms of ships by the growth of algae would be hailed as a boon by shipowners.