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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.
Railway trestle bridge in Dawson Creek, British Columbia. A trestle bridge is composed of a number of short spans supported by closely spaced trestle frames. Each supporting frame is a bent. A trestle differs from a viaduct in that viaducts have towers that support much longer spans and typically have a higher elevation. [1]
In woodworking, a trestle table is a table consisting of two or three trestle supports, often linked by a stretcher (longitudinal cross-member), over which a board or tabletop is placed. [1] In the Middle Ages , the trestle table was often little more than loose boards over trestle legs for ease of assembly and storage. [ 2 ]
Trestle or Trestles may refer to: Structures and structural elements: Trestle support, the structural element that supports a trestle bridge, trestle desk, trestle table, or similar structures; Trestle bridge, a bridge composed of trestle support elements Trestles Bridge, a railroad viaduct in California
The ladder itself is capable of being converted into several heights and configurations from a single ladder. Configurations include a straight or extension ladder, an A-frame ladder, a staircase ladder (an uneven A-frame for use on stairs), a 90° ladder, and both sides of a scaffolding trestle achieved through a triple locking hinge.
A trestle bridge is a bridge composed of a number of short spans supported by closely spaced frames. A trestle (sometimes tressel) is a rigid frame used as a support, historically a tripod used to support a stool or a pair of isosceles triangles joined at their apices by a plank or beam such as the support structure for a trestle table .