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  2. Photovoltaic mounting system - Wikipedia

    en.wikipedia.org/wiki/Photovoltaic_mounting_system

    Pole mounts, which are driven directly into the ground or embedded in concrete. Foundation mounts , such as concrete slabs or poured footings Ballasted footing mounts , such as concrete or steel bases that use weight to secure the solar module system in position and do not require ground penetration.

  3. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    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.

  4. Jacob's staff - Wikipedia

    en.wikipedia.org/wiki/Jacob's_staff

    In navigation the instrument is also called a cross-staff and was used to determine angles, for instance the angle between the horizon and Polaris or the sun to determine a vessel's latitude, or the angle between the top and bottom of an object to determine the distance to said object if its height is known, or the height of the object if its distance is known, or the horizontal angle between ...

  5. Ladder logic - Wikipedia

    en.wikipedia.org/wiki/Ladder_logic

    Ladder notation is best suited to control problems where only binary variables are required and where interlocking and sequencing of binary is the primary control problem. Like all parallel programming languages , the sequential order of operations may be undefined or obscure; logic race conditions are possible which may produce unexpected results.

  6. Guy-wire - Wikipedia

    en.wikipedia.org/wiki/Guy-wire

    A sailboat's mast is supported by shrouds (side-to-side) and stays (fore-and-aft) – nautical equivalents of guy wires.. A guy-wire, guy-line, guy-rope, down guy, or stay, also called simply a guy, is a tensioned cable designed to add stability to a freestanding structure.

  7. Glossary of climbing terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_climbing_terms

    rack A traditional climbing rack on a harness A rack A whale tail (rack) 1. Name given to the collective set of protection equipment carried by a lead climber up a climb. [1] [2] 2. A type of heavy-duty "all-weather" descender known as an "abseil rack" or a "rappel rack", consisting of metal bars on a U-shaped chassis, which is frequently used ...

  8. Ladder track - Wikipedia

    en.wikipedia.org/wiki/Ladder_track

    Ladder track is a type of railway track in which the track is laid on longitudinal supports with transverse connectors holding the two rails at the correct gauge distance. Modern ladder track can be considered a development of baulk road , which supported rails on longitudinal wooden sleepers .

  9. Guide rail - Wikipedia

    en.wikipedia.org/wiki/Guide_rail

    A guide rail is a device or mechanism to direct products, vehicles or other objects through a channel, conveyor, roadway or rail system. Several types of guide rails exist and may be associated with: Factory or production line conveyors; Power tools, such as table saws; Elevator or lift shafts