Técnicas de lectura: predicción, scanning y skimming
Tower of Pisa
The height of the tower is 55.86 m (183.27 ft) from the ground on the low side and 56.70 m (186.02 ft) on the high side. The width of the walls at the base is 4.09 m (13.42 ft) and at the top 2.48 m (8.14 ft). Its weight is estimated at 14,500 metric tons (16,000 short tons). The tower has 296 or 294 steps; the seventh floor has two fewer steps on the north-facing staircase. Prior to restoration work performed between 1990 and 2001, the tower leaned at an angle of 5.5 degrees, but the tower now leans at about 3.99 degrees. This means that the top of the tower is displaced horizontally 3.9 metres (12 ft 10 in) from where it would be if the structure were perfectly vertical.
A popular tourist activity is to pose for photographs pretending to "hold up" the leaning tower and preventing it from falling. The illusion is created through the principle of forced perspective.
Construction
Construction of the tower occurred in three stages across 177 years. Work on the ground floor of the white marble campanile began on August 8, 1173, during a period of military success and prosperity. This ground floor is a blind arcade articulated by engaged columns with classical Corinthian capitals.
The tower began to sink after construction had progressed to the second floor in 1178. This was due to a mere three-metre foundation, set in weak, unstable subsoil, a design that was flawed from the beginning. Construction was subsequently halted for almost a century, because the Republic of Pisa was almost continually engaged in battles with Genoa, Lucca and Florence. This allowed time for the underlying soil to settle. Otherwise, the tower would almost certainly have toppled. In 1198 clocks were temporarily installed on the third floor of the unfinished construction.
In 1272 construction resumed under Giovanni di Simone, architect of the Camposanto. In an effort to compensate for the tilt, the engineers built upper floors with one side taller than the other. Because of this, the tower is actually curved. Construction was halted again in 1284, when the Pisans were defeated by the Genoans in the Battle of Meloria.
The seventh floor was completed in 1319. It was built by Tommaso di Andrea Pisano, who succeeded in harmonizing the Gothic elements of the bell-chamber with the Romanesque style of the tower. There are seven bells, one for each note of the musical major scale. The largest one was installed in 1655. The bell-chamber was finally added in 1372.
After a phase (1990–2001) of structural strengthening, the tower is currently undergoing gradual surface restoration, in order to repair visual damage, mostly corrosion and blackening. These are particularly pronounced due to the tower's age and its exposure to wind and rain.
Architect
There has been controversy about the real identity of the architect of the Leaning Tower of Pisa. For many years, the design was attributed to Guglielmo and Bonanno Pisano, a well-known 12th-century resident artist of Pisa, famous for his bronze casting, particularly in the Pisa Duomo. Bonanno Pisano left Pisa in 1185 for Monreale, Sicily, only to come back and die in his home town. A piece of cast with his name was discovered at the foot of the tower in 1820, but this may be related to the bronze door in the façade of the cathedral that was destroyed in 1595. However recent studies seem to indicate Diotisalvi as the original architect due to the time of construction and affinity with other Diotisalvi works, notably the bell tower of San Nicola and the Baptistery, both in Pisa. However, he usually signed his works and there is no signature by him in the bell tower which leads to further speculation.
History following construction
Galileo Galilei is said to have dropped two cannon balls of different masses from the tower to demonstrate that their speed of descent was independent of their mass. However, this is considered an apocryphal tale, its only source being Galileo's secretary.
During World War II, the Allies discovered that the Germans were using the tower as an observation post. A U.S. Army sergeant was briefly entrusted with the fate of the tower and his decision not to call in an artillery strike kept the tower from being destroyed.
On February 27, 1964, the government of Italy requested aid in preventing the tower from toppling. It was, however, considered important to retain the current tilt, due to the vital role that this element played in promoting the tourism industry of Pisa.
On February 27, 1964, the government of Italy requested aid in preventing the tower from toppling. It was, however, considered important to retain the current tilt, due to the vital role that this element played in promoting the tourism industry of Pisa.
A multinational task force of engineers, mathematicians and historians gathered on the Azores islands to discuss stabilization methods. It was found that the tilt was increasing in combination with the softer foundations on the lower side. Many methods were proposed to stabilize the tower, including the addition of 800 tonnes of lead counterweights to the raised end of the base.
In 1987 the tower was declared as part of the Piazza del Duomo UNESCO World Heritage Site along with the neighbouring cathedral, baptistery and cemetery.
On January 7, 1990, after over two decades of stabilization studies, the tower was closed to the public. The bells were removed to relieve some weight, and cables were cinched around the third level and anchored several hundred meters away. Apartments and houses in the path of the tower were vacated for safety. The final solution to prevent the collapse of the tower was to slightly straighten the tower to a safer angle, by removing 38 cubic meters (50 cubic yards) of soil from underneath the raised end. The tower was straightened by 45 centimeters (18 inches), returning to its 1838 position. After a decade of corrective reconstruction and stabilization efforts, the tower was reopened to the public on December 15, 2001, and was declared stable for at least another 300 years.
In May 2008, after the removal of another 70 metric tons (77 short tons) of earth, engineers announced that the Tower had been stabilized such that it had stopped moving for the first time in its history. They stated it would be stable for at least 200 years.
El topico hablara o explica un tema referente a la torre de Pissa , la cual se encuentra en Italia, motivos arquitectonicos, quien fue su principal diseñador, constructor y cuando fue construida.
la construcción de la torre pissa, la cual sta ubicada en la ciudad de Pissa, Italia.
Tower, Cathedral, Floor
Cathedral, Base, Displaced, Structure, Vertical, Illusion.
Leaning Tower of Pisa, Tower of Pisa,
El texto habla sobre la torre inclinada de pissa, que es el campanario de la principal catedral de la ciudad italiana, la misma esta situada detras de la catedral y es la tercera estructura mas anitugua despues de la catedral y el baptisterio, en el año 2008 especificamente en mayo se extrajo 70 toneladas metricas de la tierra , logrando así estabilizarla por lo menos para 200 años.
Unidad 4
Patrones de Organización de un Párrafo
A. Seleccione un texto relacionado con su área de experticia. Lea el texto y extraiga:
Manufacturing
Manufacturing is the use of machines, tools and labor to produce goods for use or sale. The term may refer to a range of human activity, from ha ndicraft to high tech, but is most commonly applied to industrial production, in which raw materials are transformed into finished goods on a large scale. Such finished goods may be used for manufacturing other, more complex products, such as aircraft, household appliances or automobiles, or sold to wholesalers, who in turn sell them to retailers, who then sell them to end users – the "consumers".
Manufacturing takes turns under all types of economic systems. In a free market economy, manufacturing is usually directed toward the mass production of products for sale to consumers at a profit. In a collectivist economy, manufacturing is more frequently directed by the state to supply a centrally planned economy. In free market economies, manufacturing occurs under some degree of government regulation.
Modern manufacturing includes all intermediate processes required for the production and integration of a product's components. Some industries, such as semiconductor and steel manufacturers use the term fabrication instead.
The manufacturing sector is closely connected with engineering and industrial design. Examples of major manufacturers in the North America include General Motors Corporation, General Electric, and Pfizer. Examples in Europe include Volkswagen Group, Siemens, and Michelin. Examples in Asia include Toyota, Samsung, and Bridgestone
In its earliest form, manufacturing was usually carried out by a single skilled artisan with assistants. Training was by apprenticeship. In much of the pre-industrial world the guild system protected the privileges and trade secrets of urban artisans.
Before the Industrial Revolution, most manufacturing occurred in rural areas, where household-based manufacturing served as a supplemental subsistence strategy to agriculture (and continues to do so in places). Entrepreneurs organized a number of manufacturing households into a single enterprise through the putting-out system.
Toil manufacturing is an arrangement whereby a first firm with specialized equipment processes raw materials or semi-finished goods for a second firm.
- Marcadores de Definición: is, refer to, such as, is such as,
Gold Historical Background
Gold has a long and complex history. From gold’s first discovery, it has symbolized wealth and guaranteed power. Gold has caused obsession in men and nations, destroyed some cultures and gave power to others.Archaeological digs suggest the use of Gold began in the Middle East where the first known civilizations began. The oldest pieces of gold jewelry Egyptian jewelry were found in the tomb of Queen Zer and that of Queen Pu-abi of Ur in Sumeria and are the oldest examples found of any kind of jewelry in a find from the third millennium BC. Over the centuries, most of the Egyptian tombs were raided, but the tomb of Tutankhamen was discovered undisturbed by modern archaeologists. Inside the largest collection of gold and jewelry in the world was found and included a gold coffin whose quality showed the advanced state of Egyptian craftsmanship and goldworking (second millennium BC).
The Persian Empire, in what is now Iran, made frequent use of Gold in artwork as part of the religion of Zoroastrianism. Persian goldwork is most famous for its animal art, which was modified after the Arabs conquered the area in the 7th century AD.
When Rome began to flourish, the city attracted talented Gold artisans who created gold jewelry of wide variety. The use of gold in Rome later expanded into household items and furniture in the homes of the higher classes. By the third century AD, the citizens of Rome wore necklaces that contained coins with the image of the emperor. As Christianity spread through the European continent, Europeans ceased burying their dead with their jewelry. As a result, few gold items survive from the Middle Ages, except those of royalty and from church hoards.
In the Americas, the skill of Pre-Columbian cultures in the use of Gold was highly advanced long before the arrival of the Spanish. Indian goldsmiths had mastered most of the techniques known by their European contemporaries when the Spanish arrived. They were adept at filigree, granulation, pressing and hammering, inlay and lost-wax methods. The Spanish conquerors melted down most of the gold that they took from the peoples of this region and most of the remaining examples have come from modern excavations of grave sites. The greatest deposits of gold from these times were in the Andes and in Columbia.
During the frontier days of the United States news of the discovery of gold in a region could result in thousands of new settlers, many risking their lives to find gold. Gold rushes occurred in many of the Western States, the most famous occurring in California at Sutter’s Mill in 1848. Elsewhere, gold rushes happened in Australia in 1851, South Africa in 1884 and in Canada in 1897.
The rise of a gold standard was meant to stabilize the global economy, dictating that a nation must limit its issued currency to the amount of gold it held in reserve. Great Britain was the first to adopt the gold standard in 1821, followed, in the 1870s, by the rest of Europe followed. The system remained in effect until the end of the first world war, after which the US was the only country still honoring the Gold Standard. After the war, other countries were allowed to keep reserves of major currencies instead of gold. The arrival of the great depression marked the end of the U.S. export of gold in the 1930s. By mid 20th century, the US dollar had replaced gold in international trade.
The American Eagle Bullion program was launched in 1986 with the sale of gold and silver bullion coins. Platinum was added to the American Eagle Bullion family in 1997. A bullion coin is a coin that is valued by its weight in a specific precious metal.
- Marcadores de Tiempo
- Idea general del párrafo
El surgimiento de un patrón de oro estaba destinado a estabilizar la economía mundial, que dictan que una nación debe limitar su moneda emitida a la cantidad de oro que tenía en reserva. Gran Bretaña fue el primero en adoptar el patrón oro en 1821, seguido, en la década de 1870, por el resto de Europa siguió. El sistema se mantuvo en vigor hasta el final de la primera guerra mundial, después de lo cual los EE.UU. fue el único país que sigue en honor al patrón oro. Después de la guerra, otros países se les permitió mantener las reservas de las principales monedas en lugar de oro.
No hay comentarios:
Publicar un comentario