Iron+&+Steel

IRON & STEEL __NOtes about Iron & Steel:__
 * Iron:** it can be Mold to any shapes and it is strong in compresion. It is used in Arch bridges or cannos
 * Steel:** One of strongest materials used in construction, it is strong in compresion and tension. Steel is used for cables is suspension bridges, beams and columns in skyscrapers



corrugated iron is a building material composed of sheets of hot-dip galvanised mild steel, cold-rolled to produce a linear corrugated pattern in them. The corrugations increase the bending strength of the sheet in the direction perpendicular to the corrugations, but not parallel to them. Normally each sheet is manufactured longer in its strong direction.
 * Corrugated Iron**



Corrugated Iron is lightweight and easily transported. It was and still is widely used especially in rural and military buildings such as sheds and water tanks. Clapping hands or snapping ones fingers whilst standing next to perpendicular sheets of corrugated iron (for example, in a fence) will produce a high-pitched echo with a rapidly falling pitch. This is due to a sequence of echoes from adjacent corrugations.
 * Characteristic**

Uses through history
Corrugated Iron was invented in the 1840s, and was originally made (as the name suggests) from wrought iron. It proved to be light, strong, corrosion-resistant, and easily transported, and particularly lent itself to prefabricated structures and improvisation by semi-skilled workers. It soon became a common construction material in rural areas in the United States and Australia and later India, and in Australia also became (and remains) the most common roofing material and is even used in urban areas (in which application it is usually painted) but not as commonly as in rural areas.

What it takes to be an iron worker
Iron workes can build everything from bridges to highways and they are involved in every facets of contruction. An iron worker Have to be in good physical condition, have great strenght, balance, and good eyesight .Because this type of work normally done at great heights, people who choose this job must not be afraid of heights or suffer from diseases.


 * Activities :**

On your wiki, write your opinion about this quotation from the recording:

//"the old cast iron buildings died out. I'm not really sure whether the new skyscrapers killed them, or the new esthetics" //

With the apperance of steel, the cast iron buildings were replaced because new steel structures overcame the tension disadvantages cast iron has; since this material can't support large vertical structures, the constructions of high buildings was a tricky challenge. What the quote wants to express is that steel structures became so vanguard that they allowed the counstructions of a different and shoking type of buildings...the skyscrapers. As these buildings became more and more popular, the cast iron projects came to be an old-fashion affair.

__**Chatlog with Francis Martinez and Ana MIrabent**__