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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 ...
Mostly flat bar or angle profile and sometimes channel. Stand-off brackets: Dictated by OSHA Standard 1910.27(c)(4) stand-off brackets must be at least 7" (180 mm) longer than the farthest obstruction for clearance on the back side of ladder. This means that if there is a 4" (100 mm) gutter projecting from the side of a building, a fixed 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.
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Similar traction-improving patterns have been implemented on the surface of the wheels on tractors. These include strakes , where material is removed from the surface of the wheel to achieve protrusion; cleats , with spikes instead of straight bars; and lugs with raised rubber on a tire tread .
One end of a long metal bar is attached firmly to the vehicle chassis; the opposite end terminates in a lever, the torsion key, mounted perpendicular to the bar, that is attached to a suspension arm, a spindle, or the axle. Vertical motion of the wheel causes the bar to twist around its axis and is resisted by the bar's torsion resistance. The ...
If the ladder is parallel to the ship, it has to have an upper platform. Upper platforms are mostly turnable. The lower platform (or the ladder itself) hangs on a bail and can be lifted as required. [citation needed] To prevent damage to boats going under the ladder as the water level rises and falls, a boat fender is fitted to the end of the ...