The consolidation of these elements into an explosive powder had turn into a longtime but hazardous industry by the close of the Middle Ages. The primary efficient cannon seem to have been made of wrought-iron bars strapped collectively, however though barrels continued to be made in this fashion for some purposes, the follow of casting cannon in bronze turned widespread. The strategy of casting in bronze had been known for several millennia, however the casting of cannon offered issues of measurement and reliability. It is probably going that the bronzesmiths had been in a position to draw on the expertise of techniques devised by the bell founders as an essential adjunct to medieval church building, because the casting of a large bell posed similar issues of heating a considerable amount of metal and of pouring it into a suitable mold. Bronze, however, was an costly metallic to manufacture in bulk, in order that the widespread use of cannon in conflict needed to rely upon enhancements in iron-casting techniques.

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Ann Nutr Metab 2000