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Fixed ladder, two side members joined by several rungs; affixed to structure with no moving parts. Folding ladder, a ladder in the step ladder style with one or more (usually no more than three) one-way hinges. Ideal for use on uneven ground (e.g. stairs), as a trestle or when fully extended a Fixed ladder.
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 ...
A vehicle outfitted for firefighting, specifically one outfitted to pump water. Many rural fire engines carry a reservoir of water to pump, and use drafting and water tenders to obtain further supply. Historically, an engine (" enjin " or other spellings) was any kind of machine, tool or "contrivance".
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 ...
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.
Despite being relocated to neighboring companies, Engine 10 and Ladder 10 remained operational. Subsequently, the firehouse was reconstructed, and on November 5, 2003, "Ten House" was ceremoniously reopened. On June 10, 2006, a 6-foot-tall (1.8 m), 7,000-pound (3,200 kg) mural was unveiled on the side of "Ten House".
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.
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.
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