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2. Locks on the Chesapeake and Ohio Canal - Wikipedia

   en.wikipedia.org/wiki/Locks_on_the_Chesapeake...

   Locks were often whitewashed to make them easier to see at dawn or dusk. [17] The locks were built on a foundation of 12 inch x 12 inch timbers, spaced about a foot apart, laid longitudinally below the walls, overlain by traverse timbers, also 12 inch x 12 inch. These in turn were overlain with 3-inch planks, with the masonry placed upon them.

3. Fender (boating) - Wikipedia

   en.wikipedia.org/wiki/Fender_(boating)

   In boating, a fender is an air-filled ball or a device in other shape and material used to absorb the kinetic energy of a boat or vessel berthing against a jetty, quay wall or other vessel. [1] Fenders, used on all types of vessels, from cargo ships to cruise ships, ferries and personal yachts, prevent

4. Panama Canal locks - Wikipedia

   en.wikipedia.org/wiki/Panama_Canal_locks

   The Panama Canal locks (Spanish: Esclusas del Canal de Panamá) are a lock system that lifts ships up 85 feet (26 metres) to the main elevation of the Panama Canal and lowers them down again. The original canal had a total of six steps (three up, three down) for a ship's passage.

5. Bridge protection systems - Wikipedia

   en.wikipedia.org/wiki/Bridge_protection_systems

   Pile-supported fender system on the James P. Houlihan Memorial Bridge. Fender systems attached to the pier with the goal to absorb the vessel impact. Their ability to withstand a typical ship collision is low. Fenders are built using a variety of materials: [8] thin-walled concrete box; thin-walled steel membrane steel; rubber.

6. 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 ...

7. Lock keeper - Wikipedia

   en.wikipedia.org/wiki/Lock_keeper

   When the boat did resume its journey, the lock keeper followed on horseback, all the way to Cumberland (the end of the canal) with a club threatening to settle things. [8] There were plenty of incidents with negligent lock keepers. On September 11, 1895 at Lock 22, the boat Excelsior arrived, and tried to lock through. The lock keeper was so ...