Popular Science Monthhi
���some of them witli perishable cargos promised on early delivery.
One of the engineers hit upon the ingenious if somewhat hazardous scheme of injecting enougli water into the lock to force the gate back into place. Ac- cordingly, the ^•al\•es were turned on, water flowed in, and the gate was slowly pushed back into its old position.
��While this makeshift repair was satis- factory for the time being, when naviga- tion closed this fall, the gate was entire- ly repaired.
This is the new "Xumber three" lock, which was put in commission about a year ago to cope with the increasing freight and passenger traffic between Lake Superior and the lower lakes.