Popular Science Monthhi 



235 



some of them witli perishable cargos 

 promised on early delivery. 



One of the engineers hit upon tlie 

 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. 



