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April, 1913 THE MARINE REVIEW | 125 gate will be a standard railroad track over which freight will be hauled to the power house. It is interesting to note that the new gates in the Kaiser Wilhelm canal in connection with a lock 160 ft. wide, with a lift of .57 ft., will be patterned after the buoy- ancy gates at the Keokuk lock. The time required for a boat to go through this new lock will be about 10 minutes, also for 60 miles up the river above the dam there will be deep water permitting full speed and the numerous crossings of the channel will of course be eliminated. It re- quires over one hour to go through the three locks now in use and two hours for a boat to pass through the canal under slow speed. Steamboat officers who have been making the run for many years estimate that the time between Keokuk and Montrose, a distance of 12 miles, will be short- ened fully two hours. The new lock will be opened for service early in the summer of 1913. The Dry Dock The dry dock, which is shown in plan in Fig. 5, will be built alongside the new lock between the latter and the Iowa shore, covering a large area where the lower lock of the old canal is now located, together with the headquarters building of the United FIG. 9--UP-STREAM SIDE OF LOWER GATE States engineer officer in charge of this part of the river. Considerable the gate rises to its original position, valves are interlocked so that mis- filling has been necessary to construct closing the lock, as indicated at the takes cannot be made by the man _ the dry dock, the floor of which rests extreme left in Fig. 7. The control operating the gate. On top of the on piles. The dock is of the graving FIG. 11I--BUOYANCY TYPE GUARD GATE AT UPPER END OF LOCK