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UPVC WINDOWS LEEDS

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The name "Leeds" came from "Loidis" (Bede states: "...regione quae vocatur Loidis" region known as Loidis), a word of Celtic origin, also surviving in the nearby place names of Ledston and Ledsham. Leeds has been known since being mentioned (as "Ledes") in the Domesday Book of 1086, (the name evolved into "Leedes" and finally "Leeds"). Leeds was an agricultural market town in the Middle Ages, and received its first charter in 1207. In the Tudor period Leeds was mainly a merchant town, manufacturing woollen cloths and trading with Europe via the Humber estuary, and the population grew from 10,000 at the end of the 17th century to 30,000 at the end of the 18th. At one point nearly half of England's total exports passed through Leeds. The Industrial Revolution resulted in the radical growth of Leeds whose population rose to over 150,000 by 1840. The city's industrial growth was catalysed by the introduction of the Aire & Calder Navigation in 1699, Leeds and Liverpool Canal in 1816 and the railway in 1848. In 1893 Leeds was granted city status. The industries that developed in the Industrial Revolution included making machinery for spinning, machine tools, steam engines and gears as well as other industries based on textiles, chemicals and leather and pottery. Coal was extracted on a large scale and the still functioning Middleton Railway, the first successful commercial steam locomotive railway in the world, transported coal from Middleton colliery into the centre of Leeds. The first permanent set of fully automatic traffic lights in the world were installed at the junction of Park Row and Bond Street, Leeds, in 1928. By the 20th century this social and economic status started to change with the creation of the academic institutions that are known today as the University of Leeds, Leeds Metropolitan University and Leeds Trinity & All Saints. This period also witnessed expansion in medical provision particularly Leeds General Infirmary and St James's Hospital. Following World War II there was a decline in secondary industries that had thrived in the 19th century. In 1951, half the workforce was still in manufacturing; by 1971 the figure was a third. Leeds lost a third of its manufacturing jobs during 1971–1981 (Champion & Townsend, 1990, p.82). In 1991, 64,000 were employed in manufacturing. In 2003, 2,103 firms employed 44,500 (10% of workforce) - see Leeds Economy Handbook. But there are still some large engineering firms. The largest make turbine blades, components, alloys, valves and pipelines for the oil industry, switchgear, printers' supplies, copper alloys, surgical and hospital equipment, pumps, motors, radiators.

History Polyvinyl chloride was accidentally discovered on at least two different occasions in the 19th century, first in 1835 by Henri Victor Regnault and in 1872 by Eugen Baumann. On both occasions, the polymer appeared as a white solid inside flasks of vinyl chloride that had been left exposed to sunlight. In the early 20th century, the Russian chemist Ivan Ostromislensky and Fritz Klatte of the German chemical company Griesheim-Elektron both attempted to use PVC (polyvinyl chloride) in commercial products, but difficulties in processing the rigid, sometimes brittle polymer blocked their efforts. In 1926, Waldo Semon and the B.F. Goodrich Company developed a method to plasticize PVC by blending it with various additives. The result was a more flexible and more easily-processed material that soon achieved widespread commercial use.

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