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2. Steamboats of the Columbia River - Wikipedia

   en.wikipedia.org/wiki/Steamboats_of_the_Columbia...

   The steel-built steam tug Jean is also in Portland, but has been stripped of her paddle wheel and is lying in a semi-derelict state in North Portland Harbor (Oregon Slough). Another boat, W.T. Preston, a Corps of Engineers snagboat, survives as a museum at Anacortes and is reported to be operational.

3. Linkspan - Wikipedia

   en.wikipedia.org/wiki/Linkspan

   Initially a linkspan was a ramp that was attached to the pier at one end and was suspended above the water at the other. The height above the water was controlled either by hydraulic rams or cables, these types of linkspans were less well designed for the various conditions of the tide, wave and current and so were superseded by underwater tank linkspans that through compressed air can be ...

4. Roll-on/roll-off - Wikipedia

   en.wikipedia.org/wiki/Roll-on/roll-off

   Roll-on/Roll-off car carrying ship being boarded by articulated haulers at the Port of Baltimore RoRo ports and inland waterways of the United States. Roll-on/roll-off (RORO or ro-ro) ships are cargo ships designed to carry wheeled cargo, such as cars, motorcycles, trucks, semi-trailer trucks, buses, trailers, and railroad cars, that are driven on and off the ship on their own wheels or using ...

5. Paddle wheel - Wikipedia

   en.wikipedia.org/wiki/Paddle_wheel

   The paddle wheel is a device for converting between rotary motion of a shaft and linear motion of a fluid. In the linear-to-rotary direction, it is placed in a fluid stream to convert the linear motion of the fluid into rotation of the wheel. Such a rotation can be used as a source of power, or as an indication of the speed of flow.

6. Explainer-What is the Panama Canal and why has Trump ... - AOL

   www.aol.com/news/explainer-panama-canal-why...

   Latin American leaders on Monday rallied to Panama's defense after U.S. President-elect Donald Trump threatened to reimpose U.S. control over the Panama Canal, a key global shipping route located ...

7. Paddle steamer - Wikipedia

   en.wikipedia.org/wiki/Paddle_steamer

   Left: Riveted steel paddle wheel from a sidewheeler paddle steamer on the lake of Lucerne Right: Detail of a steamer. The paddle wheel is a large steel framework wheel. The outer edge of the wheel is fitted with numerous, regularly spaced paddle blades (called floats or buckets). The bottom quarter or so of the wheel travels under water.