1) " Ladders" -- As it applies to Ladders And Scaffolding A ladder Missing image Portable_ladder.jpg A portable ladder A ladder is a vertical set of steps. There are two types: rigid ladders that can be leaned against a vertical surfacesuch as a wall, and rope ladders that are hung fromthe top. The steps of a ladder are called rungs, and the vertical members of a rigid ladder are called stiles. Rigid ladders areusually portable, but some types are permanently fixed to buildings. Rigid ladders are available in many forms, such as: fixed ladder (two stiles joined by several rungs; no moving parts)extension ladder (fixed ladder divided into two or more lengths for more convenient storage; the lengths can be slid togetherfor storage or slid apart to maximise the length of the ladder; a pulley system may be fitted so that the ladder can be easilyextended by an operator on the ground)step ladder (hinged in the middle to form an inverted V, with stays to keep the two halves at a fixed angle) platform steps (step ladder with small horizontal platform at the top) telescopic ladder (stiles consist of short lengths of concentric tubing that can be slid inside each other for storage) roof ladder (rigid ladder with large hook at the top to grip the ridge of a pitchedroof) hook ladder (rigid ladder with a hook at the top to grip a windowsill;used by firefighters) turntable ladder (extension ladder fitted to rotating platformon top of a fire engine ) Rigid ladders were originally made of wood, but in the 20th century tubular aluminium became more commonbecause of its lighter weight. Ladders with fibreglass stiles are used for working on or nearoverhead electrical wires, because fibreglass is an electrical insulator. For safety, a rigid ladder should be leaned at an angle of about fifteen degrees to the vertical. In other words, the distancefrom the foot of the ladder to the wall should be about...
2) " And" -- As it applies to Ladders And Scaffolding Logical conjunction (usual symbol and ) is a logicaloperator that results in true if both of the operands are true. Contents 1 Definition 2 Associativity and commutativity 3 Symbol 4 Bitwise operation 5 "But" Definition In logic and technical fields that use it, conjunction, or and, is a logical operator in logical calculi, and a rule of inference in deductive systems. The result of conjoining twopropositions is also called their conjunction. The conjunction is true if both of the combined propositions are true; else it is false. For two inputs A and B, the truth table of the operator isas follows. A B A and B F F F F T F T F F T T T Intuitively, the logical operator works the same as the common English word "and". The sentence "it's raining, and I'm inside"asserts that two things are simultaneously true: that it's raining outside, and that I'm inside. Logically, this would be denotedby saying that A stands for "it's raining", B stands for "I'm inside", together A AND B. For example, consider: x > 13 AND x < 27. If x is 36, then x > 13 is true, but x < 27 is false, so this sentence is false. But if x is20, then both parts of the sentence are true, so the entire conjunction is also true. The analogue of conjunction for a (possibly infinite ) family of statements is universal quantification, which is part of predicate logic. As a rule of inference Conjunction is a valid, simple argument form : A, B. Therefore, A and B. or in logical operator notation: A, B The argument form has two premises. The first premise is the left conjunct, the second premise the right conjunct. From thesetwo premises it can be logically concluded that A and B, must be true as well. Here is an example of an argument that fits the form conjunction :...
3) " Scaffolding" -- As it applies to Ladders And Scaffolding Bamboo scaffolding can reach great heights Scaffolding is a temporary modular system of metal pipes (termed tubes in Britain) forming a framework used to supportpeople and material in the construction or repair of buildings and other large structures. British Scaffolding The following description is for 'classic' rather than system scaffolding. All scaffolds are subject to certain minimum requirements set out inBritish Standard (BS) 5973 - the Code of Practice for Access and Working Scafolds and Special Scafold Structures in Steel. TheProvision and Use of Work Equipment Regulations (1993) also applies. Materials The basic materials are tubes, couplers and boards. Tubes are either steel or aluminium. If steel they are either 'black' or galvanised. The tubes come in a variety of lenghtsand a standard diameter of 48.3 mm. The chief difference between the two type of tubes is the greater lightness of aluminiumtubes (1.7 kg/m as opposed to 4.4 kg/m) and also a greater flexibility and so less resistance to force. Tubes are generallybought in 6.3 m lengths and can then be cut down to certain typical sizes. Boards provide a working surface for users of the scaffold. They are seasoned wood and come in three thicknesses (38 mm(usual), 50 mm and 63 mm) are a standard width (225 mm) and are a maximum of 3.9 m long. The board ends are protected by metalplates called hoop irons or sometimes nail plates. As well as wood steel or aluminium decking is used or laminate boards. As wellas boards for the working platform there are sole boards which are placed beneath the scaffolding if the surface is soft orotherwise suspect, although ordinary boards can be used, and meet the minimum requirements, they can be too long and tougherboards can be necessary.Couplers are the fittings which hold the tubes together The most common are called scaffold couplers, there are three basictypes: right-...
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