TIDAL DOCKS are adapted to locations where the range of the tides is small, as along the Atlantic and Gulf coasts of the United States, where this range varies from 9 feet. on the New England coast, to about 2 feet at Galveston, Tex.. at the Mediterranean ports, at Glasgow, Scotland. and Hamburg,. Germany. The almost universal form of dock in America a of rectangular water-spaces between piers which project out from the bulkhead line, although tidal basin dock, are found in a few places. The Atlantic Docks and the Erie Basin in Brooklyn are examples. The Atlantic Doeks were com menced in 1S41 and were several year in con struction. More than 200 acres of land were secured by the Atlantic Dock Company, and 40 acres of low marsh land were converted into a basin. Excavation over the whole 40 acre, was done mainly dredging machines and was carried to a depth of 20 feet below low-water mark. The outer inclosure was made with piers
of crib-work, Consisting of timber filled with stone, which were sunk into trenches 30 feet below high-water mark. The erib, were 25 feet thick at the base and were placed 150 feet apart. that being the width of the pier. In the basin are a number of wooden piers where vessels are loaded. Upon the crib-work piers large stone warehouses are built. (In the inland side is the commercial wharf, 2000 feet in length. The Erie Basin, near the Atlantic Dock, contains two graving docks. The Kingston and the Queen's Docks in Glasgow, Scotland, are good example, of tidal docks, The Kingston Dock has an area of 5r,j acres. a quay space of 2490 feet, and a depth of about 24 feet the Queen's Dock has an area of :34 acres, a quay space of 10.
000 feet, and a depth of front 27 to :30 feet.