Tides have a lot to do with it, winds too. Downbound loaded lakers coming off of Lake Superior have been known to wait west of the Soo locks for a strong westerly wind. raises the lake level enough so they don't scrape going through the locks. The tide can be a 2-3 foot change in the course of one day, at least it was on both the bays I lived by (Gulf of Corinth and Tampa Bay) And as another poster explained the Panama canal is there to raise or lower the ships to the level of the lake they cross inland and then back to sea level.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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