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2. Caisson lock - Wikipedia

   en.wikipedia.org/wiki/Caisson_lock

   The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower canal boats ...

3. Porthole - Wikipedia

   en.wikipedia.org/wiki/Porthole

   A porthole, sometimes called bull's-eye window or bull's-eye, [1] is a generally circular window used on the hull of ships to admit light and air. Though the term is of maritime origin, it is also used to describe round windows on armored vehicles , aircraft , automobiles (the Ford Thunderbird a notable example) and even spacecraft .

4. Category:Locks (water navigation) - Wikipedia

   en.wikipedia.org/wiki/Category:Locks_(water...

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

5. Lock (water navigation) - Wikipedia

   en.wikipedia.org/wiki/Lock_(water_navigation)

   The boat enters the lock. 8–9. The boat enters the lock. 3. The lower gates are closed. 10. The upper gates are closed. 4–5. The lock is filled with water from upstream. 11–12. The lock is emptied by draining its water downstream. 6. The upper gates are opened. 13. The lower gates are opened. 7. The boat exits the lock. 14. The boat exits ...

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7. Willamette Falls Locks - Wikipedia

   en.wikipedia.org/wiki/Willamette_Falls_Locks

   The Wallamet Falls Canal and Locks Company, with authorized capital of $300,000, was incorporated on September 14, 1868 by N. Haun, Samuel L. Stephens, of Clackamas County, and experienced steamboat captain Ephraim W. Baughman (1835–1921) [7] [8] to "locate and construct a canal and suitable boat locks at the falls of the Willamette River, on the west side of said falls".

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