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It is the use of spreaders (long treads that extend well past the vertical ropes) in a pilot ladder that distinguishes it from a Jacob's ladder. When not being used, the ladder is stowed away, usually rolled up, rather than left hanging. On late 19th-century warships, this kind of ladder would replace the normal fixed ladders on deck during battle.
A retractable bridge is a type of moveable bridge in which the deck can be rolled or slid backwards to open a gap while traffic crosses, usually a ship on a waterway. This type is sometimes referred to as a thrust bridge. The bridge is retracted to the right. Borden Avenue Bridge, Long Island City. Retractable bridges date back to medieval times.
An attic ladder (US) or loft ladder (UK) is a retractable ladder that is installed into an attic door/access panel. They are used as an inexpensive and compact alternative to having a stairway that ascends to the attic of a building. They are useful in areas with space constraints that would hinder the installation of a standard staircase.
Pages in category "Retractable bridges" The following 9 pages are in this category, out of 9 total. This list may not reflect recent changes. ...
USS Artisan with USS Antelope (IX-109) and LST-120 in the dock at Espiritu Santo, New Hebrides Islands, 8 January 1945 Los Alamos (AFDB-7), with a repaired submarine at Holy Loch, Scotland in 1985 YFD-2 The first Yard Floating Dock built in 1901, arriving Pearl Harbor 23 October 1940 from New Orleans Naval Yard USS Pennsylvania in drydock USS Dewey, the second YFD, c. 1906–1907
The ladder was designed to use attraction water: fresh water flowing swiftly out the bottom of the fish ladder, in the direction opposite which anadromous fish migrate at the end of their lives. However, the attraction water from this first ladder was not effective. Instead, most salmon used the locks.
An auxiliary repair dock (ARD) is a type of floating drydock employed by the U.S. Navy, especially during World War II. The Navy commissioned 33 ARD vessels: ARD-1 through ARD-33. ARDs were self-sustaining in World War II. ARDs have a rudder to help in tow moving, making ARDs very mobile, and have a bow to cut through waves.
An extension ladder. A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.
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