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July, 1909 TAE MarRINE REVIEW 189 Fic, 6.--Ctiose View or Movaste DAm witH ALL BUT Four WICKETS IN POsITION. river after lightering part of her car- about 15 minutes after the accident, go, and then proceeded to her destina- from the lower end or lock, shows tion at Owen Sound. The Walker and the demolished gates still hanging to Crescent City were given temporary the masonry. The lower guard gates, repairs so that after a few days they used only when the chamber is to be were able to proceed. All three have dried out, can also be seen. This since been dry-docked; the Assiniboia view also shows one of the inner pair at Collingwood, the Walker at Superior of lower gates which are used only in and the Crescent City at Toledo. The case of damage to the outer or main Assiniboia had 24 damaged plates, of gates as in this case, and 'which are which 17 were rerolled and put back intact so that so far as the lower end and seven faired in place, and a num- is concerned, locking could still be ber of frames were also :straightened. proceeded with. : The Crescent City is reported to be- Fig. 2 is a. view taken at the same one of the worst cases. of damage time as Fig. 1 near the upper end of ever occuring the lakes, and will have the: lock, looking west,. and shows the to be given an almost entirely new otal disappearance of the main gates. bottom and floors. That she .did not Fig. 3 is a view taken from above actually break in two in passing over the lock chamber, looking east. The the upper sill, is nothing - short of tints seen hanging over the lock wall marvelous. Probably a large part of 4. those of the steamers which were her bottom damage was occasioned in the locke and which were snapped thereby and was completed by her Qf jie thread. In this and in Fig. 2 downward rush into the shoal water 'the break of the current over the at the foot of the canal. upper sill is plainly evident. Another The Walker's damages are reported pair of gates are also visible, but to consist of shoe and rudder and these are not available for locking be- cause of the fact that the filling cul- vert is located between the two sets of upper gates. Fig. 4 shows the movable dam above the lock swung into position and the flow of water falling off. The dam is seen in Fig. 2 in: its normal posi- tion. Fig. 5 from the lower end of lock slight damage forward. The rush of water through the lock tore adrift the upper main gates which, as before noted, had not yet been closed, thus leaving open an unob- structed channel from Lake Superior. _ The photographs herewith tell, graph- ically, the story from the time the chamber emptied itself. Fig. 1, taken shows the south gate falien down and comparison with Fig. 1 shows the effect of the dam in reducing the flow of water. Figs, 4 and. 5 were taken the day following the accident, Fig. 6 is a near view of the dam and shows its construciton. It is prac- tically a swing bridge, one arm carry- ing the wickets in which slide the closing-off gates and which when not in use, are folded up under the floor of the bridge; the other arm is merely a counterweight. -- The fact that some of the wickets fouled an obstruction in the bottom of the canal, making their operation ° impossible, somewhat delayed the com- plete closing off of the flow of water, and alternative methods had to be adopted; but by the morning of June 13 these efforts had been so far suc- cessful that it became possible to close the gates, and the lock has since been repaired and was replaced in commis- sion on June 21. The lock walls are not damaged nor any of the operating ma- chinery, and the total cost of repairs will not be heavy. After all, the chief feature of the entire accident is the demonstration of the possibility of controlling lock canals even in case of the carrying . away of gates and is nor without value in connection with the Panama Canal.