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DETROIT DRY DOCK bed, which completely shuts off all water from leaking through the sides. The soil at this point is fine blue clay, which has enabled the work to progress without interruption from landslides or leakage of water. Two thousand piles were driven in the dock, making it as strong as it is possible to be. Loaded ships, carrying a cargo of 3,000 tons, can be safely docked, and those of the largest dimensions can be easily taken in. This dock is large enough to take in any boat now upon the great lakes, and has been designed especially for the wide railway car ferries and passenger boats with their overhanging guards and paddle wheels. There has also been added to the Detroit Dry Dock Company's plant a pair of steel shear legs for hoisting boilers, engines, spars, etc., from and into boats. They are located just above the dock, are 100 feet high, and have a lifting capacity of 100 tons. The pumping plant, which is very complete, consists of two centrifugal pumps with 30 inches discharge each. These are driven by two 150 horse power independent compound Westing-house engines. These pumps are in a well 22x11 feet inside and 35 feet deep, the water passing from the dock to the well through a brick tunnel $}4 feet diameter and 55 leet long. The steam for the engines is supplied by a battery of three boilers, 5^ feet in diameter and 15^2 feet long, built by the Dry Dock Engine Works. Oil is used for fuel, and the whole pumping plant is housed in a two story brick building, 34x81 feet. A dynamo-room is provided, where an electric light plant furnishes the entire shipbuilding plant with light. The second floor of the building is utilized by the workmen at noon and other hours, when work may be temporarily suspended, and is fitted up for their comfort. rS DOCKING PLANT. 116 THE SECOND UPPER DOCK. The dock described in the foregoing columns is located in the yard to the rear of the office and opposite the Engine Works, as may be seen by the diagram on page 84, which diagram also locates the second upper dock, or dock No. 1. It is very convenient for vessels of ordinary size which need immediate docking when the new dock is in use. Its proximity to the saw mill and all the other departments of the Dry Dock Company plant make it available for extensive repair jobs as well as for temporary repairs. Its dimensions are: 245 feet long, 48 feet wide, and 8 feet 3 inches over sill. THE TWO LOWER DOCKS (THE CLARK DOCKS). These docks are located about a mile down the river from the main plant, and are advantageous for caulking and winter repair or rebuild work. Among the views which follow are two of the lower docks, one showing the Canadian steamer Athabasca in one of the docks and the other showing the City of Cleveland in the larger of the two docks. The dimensions of the lower decks are: Dock No. 1—360 feet long, 66 feet wide, 10 feet over sill. Dock No. 2—220 feet long, 42 feet wide and 10 feet over sill normal stage of water.