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  2. Attic ladder - Wikipedia

    en.wikipedia.org/wiki/Attic_ladder

    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.

  3. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    Attic ladder, pulled down from the ceiling to allow access to an attic or loft. Bridge ladder, a ladder laid horizontally to act as a passage between two points separated by a drop. Boarding ladder, a ladder used to climb onto a vehicle. May be rigid or flexible, also boarding step(s), and swim ladder. Cat ladder (US chicken ladder), a ...

  4. Wall bars - Wikipedia

    en.wikipedia.org/wiki/Wall_bars

    Amanda Françozo using wall bars. Gymnasts at the Royal Gymnastics Central Institute of Stockholm, 1900. Yugoslav boys using wall bars, 1957. Gymnastic wall bars (also known as a gymnastic ladder, Swedish ladder, Swedish wall or as stall bars) were invented at the beginning of the 19th century by the Swedish teacher Per Henrik Ling who, when suffering from arthritis, realized the therapeutic ...

  5. Fuel ladder - Wikipedia

    en.wikipedia.org/wiki/Fuel_ladder

    A fuel ladder or ladder fuel is a firefighting term for live or dead vegetation that allows a fire to climb up from the landscape or forest floor into the tree canopy. [1] [2] Common ladder fuels include tall grasses, shrubs, and tree branches, both living and dead. The removal of fuel ladders is part of defensible space 'firescaping' practices.

  6. Helicopter Rope Suspension Technique - Wikipedia

    en.wikipedia.org/wiki/Helicopter_Rope_Suspension...

    Helicopter Rope Suspension Technique (HRST) is a military term for techniques and methods of rappelling, fast roping, Special Patrol Insertion/Extraction (SPIE) and Jacob's Ladder operations. Helicopter Rope Suspension was developed as a means to insert and/or extract, by helicopter, ground forces (primarily reconnaissance teams) into or from ...

  7. Outdoor wood-fired boiler - Wikipedia

    en.wikipedia.org/wiki/Outdoor_wood-fired_boiler

    The outdoor wood boiler is a variant on the indoor wood, oil or gas boiler. An outdoor wood boiler or outdoor wood stove is a unit about 4-6 feet wide and around 10 feet long. It is made up of four main parts- the firebox, which can be either round or square, the water jacket, the heat exchanger, and the weather proof housing.

  8. Ground-coupled heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Ground-coupled_heat_exchanger

    An open system combined with energy recovery ventilation can be nearly as efficient (80-95%) as a closed loop, and ensures that entering fresh air is filtered and tempered. Combination system: This can be constructed with dampers that allow either closed or open operation, depending on fresh air ventilation requirements.

  9. Jacob's ladder (nautical) - Wikipedia

    en.wikipedia.org/wiki/Jacob's_ladder_(nautical)

    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.

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