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The US naval jack (2002–2019) being raised on a jackstaff in 2002. A jack staff (also spelled as jackstaff) is a small vertical spar (pole) on the bow of a ship or smaller vessel on which a particular type of flag, known as a jack, is flown. [1] The jack staff was introduced in the 18th century. [2]
The machinery is specifically designed for anchor handling operations. They also have arrangements for quick anchor release, which is operable from the bridge or other normally crewed locations in direct communication with the bridge. The reference load used in the design and testing of the towing winch is twice the static bollard pull.
Strandjack at Freybridge in Berlin–Spandau 52° 30′ 42,11″ N, 13° 12′ 11,7″ O. A strand jack (also known as strandjack) is a jack used to lift very heavy loads (e.g. thousands of tons or more with multiple jacks) for construction and engineering purposes. [1]
A downline is a diving jackstay from an anchor point at or above the surface to the underwater workplace used to control descent, ascent and the transfer of tools, materials and other equipment between the surface and the workplace. [4] Functions: Guiding divers to and from the underwater workplace.
The hull is actually a water-tight barge that floats on the water’s surface. When the rig reaches the work site, the crew jacks the legs downward through the water and into the sea floor (or onto the sea floor with mat supported jackups). This anchors the rig and holds the hull well above the waves. [citation needed]
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Bitts aboard wooden sailing ships (sometime called cable-bitts) were large vertical timbers mortised into the keel and used as the anchor cable attachment point. [2] Bitts are carefully manufactured and maintained to avoid any sharp edges that might chafe and weaken the mooring lines.
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