The pipes and frame were put together on the south side of the river, and the end of the pipe intended for the north side, was stopped with a plug, when a trench having been previously prepared to receive them, by the assistance of machinery, the flexible conduit, with its bed of wood, was hauled across the river, the moveable joints of the pipes, and the hinges of the frames allowing the whole range to assume the form required by the bottom of the Clyde. The operation was aided by pontons, and the machinery employed to haul it into its place, was of course, fixed on the north side of the river. When the plugged end of the main emerged from the current, it was immediately opened and connected with the pipe leading to the reservoir of the forcing pumps. For the purpose of protecting this main from any injury from vessels passing along the Clyde, the whole of the part under water was covered with gravel and stones. This ingenious and useful contrivance was executed in 1810 but one main being found insufficient for the demand on the works, in 1818, another of 28 inches diameter, arid subsequently a third of 36 inches, was laid across the river. The two last conveyed filtered watered only."t

There are six engines at Dalmarnock, which propel the water across the Clyde, which is there about 100 yards broad, into the reservoirs in the city of Glasgow, to a height of 157 feet above the level of the river. The houses are generally very high,