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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.
Folding ladders are usually found in lengths between 8 and 16 feet (2.4 and 4.9 m), while the greatest length is usually 10 feet (3.0 m). These ladders must also have footpads attached to the butt end in order to prevent slipping on hard and soft surfaces.
Folding chair, collapses in some way for easy storage and transport. Various folding chairs have their own names (e.g., deckchair, director's chair), but a chair described simply as a folding chair folds a rigid frame and seat around a transverse axis so that the seat becomes parallel to the back and the frame collapses with a scissors action.
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The problem. Crossed ladders of lengths a and b. h is half the harmonic mean of A and B; equivalently, the reciprocals of A and B sum to the reciprocal of h (the optic equation ). Given a, b, and h, find w. Two ladders of lengths a and b lie oppositely across an alley, as shown in the figure. The ladders cross at a height of h above the alley ...
Scaffolding for rehabilitation in Madrid, Spain [ 1] Scaffolding, also called scaffold or staging, [ 2] is a temporary structure used to support a work crew and materials to aid in the construction, maintenance and repair of buildings, bridges and all other human-made structures. Scaffolds are widely used on site to get access to heights and ...
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