Introduzione terza fonte, Clark University, F. Walker

La terza fonte che ho consultato è la ricerca effettuata da F. Walker dal titolo: "The Industries of Bristol". Fu pubblicata nell'edizione del luglio 1946 della rivista "Economic Geography" dell'Università di Clark.

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Acido fluorosolfonico

Composizione: Un atomo di zolfo, tre di ossigeno, uno di fluoro e uno di idrogeno. Catalizzatore: -unito al pentafluoruro di antimonio produce l' acido magico , un superacido (composto in grado di protonizzare qualsiasi prodotto). Esso viene usato come catalizzatore nelle reazioni di rottura e di riarrangiamento (reazioni che producono isomeri di struttura rispetto alle molecole di partenza) di idroperossidi terziari e alcoli terziari ( prodotto dalla Sigma Aldrich, già citata nel post precedente). Refrigerante: -usato per la produzione del fluoruro di vinilidene .
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Prima fonte, Cambridge University, F. Greenaway

Da pagina 294 a pagina 296:   A History of the Zinc Smelting Industry in Great Britain. By E. J. Cocks and B. Walters . London: Harrap. I968. Pp. vi+224, 42 illustr. /j2.75. The final words of the preface to this book arouse expectations: " Coal, iron, steel, textiles and railways have appeared to monopolise the attention of industrial historians hitherto, and a great deal more information on the development of the non-ferrous metals and chemical industries would help towards correcting the rather distorted picture that the average textbook gives of our continuing Industrial Revolution."  If this book fails to live up to the implied ambition to produce a revealingf work, it is because it is a piece d'occasion tied too tightly for historical perspective to the event which produced it, namely, "the 50th anniversary of the first beginnings of what is now the Imperial Smelting Corporation Limited, the group which has been, since 1933, the sole processo...
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Testo terza fonte, Clark University, F. Walker

Pagine 180-181: Local zinc first became important during the 17th century when it was used in manufacture of brass along with Cornish copper which could be bought very cheaply at the period as a bye-product of the gold, silver and tin mining and which was easily shipped to It was during the 18th century however that manufacture of lead, brass and zinc developed most rapidly in Bristol. By the middle of the century there was a large lead-producing plant near Hotwells and in 1752 the making of lead shot was commenced in Bristol and still remains as a specialised local industry. The large scale production of zinc commenced in 1743 at Warmley , whilst Cornish copper was smelted in Bristol to supply the local brass in dustry which in the later half of the century expanded to such an extent that it was producing half the total British output of brass wire. In the 20th century production and use of brass and copper has declined though there are still a number of firms in Bristol engag...
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