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delays may lead to another

News from my dear studies: I tried these days of progress a specific point: when do we begin to recast the cast iron, for example the "throw in the mold," as said Gabriel Jars in 1765: making objects casting, cauldron Gun of 36 through the beam or the pump. Since the fourteenth century, the iron produced in blast furnaces, which means it produces what is known today about the cast, which was subsequently refined to obtain iron. If what you want, they are objects cast, the mold is placed at the foot of the blast furnace and there leads the cast during the casting. That is until the eighteenth century the only way to do so, since it knows no way to melt the iron - which is why we do not call cast iron cast but when s 'acts or molded objects pig iron for the intermediate product to refineries in English cast iron pig iron and . The term font is used, but it's green cast , ie bronze, that is: we know from the proto-history to melt, the 800 ° n ' is not hell, after all. Talk about melting a metal that was melted, it is not absurd.

A significant change occurred in England between the late seventeenth and early eighteenth century: it manages to consolidate the iron, using a particular type of furnace that was used then for copper and lead: reverberatory furnace (See cons below). The iron is remelted in this way is not wrought iron, pure iron, but what is known today of casting an alloy of iron and carbon with high degree of carbon (more than 2% if I remember correctly), which lowers its melting point at 1200 °. So either pigs produced by the blast furnace, or residues of iron casting objects or old barrels or other objects they desired to recycle iron. These techniques are imported into France in the 1770s, we began to encounter the term iron foundry and therefore cast iron - since we know to produce a liquid other than in a transitional phase at the exit of the furnace.

What is curious is that this major change is very little studied. The reason for this: This new feature is closely related to another, that of coke use in blast furnaces. The fuel is from the same source (coal mine) even if the reverberatory furnace does not require its coking and, in addition, places and these men are confused, especially in Coalbrookdale, the Anglo-Welsh border ( illustration at the top of the article is to clearly see the reverberatory furnaces). And as the issue of coke, which carries with it all the heavy industry of the nineteenth and twentieth centuries, has always worried and concerned about the historians at the forefront of technology, that of the cast (like product that could be consolidated at will) found itself largely obscured.

is what I said, a question may hide another.

Illustration: Detail of A View of the Upper Work at Coalbrookdale in the County of Salop [Shropshire], 1758, published in TS Ashton, Iron and Steel In The Industrial Revolution , Manchester University Press, 1924; Furnace for Iron Scrap Melting at Southwark (London), by RR Angerstein, 1753, published in RR Angerstein's Illustrated Travel Diary, 1753-1755 , trans. and ed. T. and P. Berg, London, Science Museum, 2001.