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Bell foundry crucibles had to be larger at about 60 cm. [14] These later medieval crucibles were a more mass-produced product. The cementation process, which was lost from the end of the Roman to the early Medieval period, continued in the same way with brass.
In 1991 Crucible Materials and General Motors' Central Foundry Division begin three years of joint research and development in die casting, tooling and machine elements, and Crucible Materials Corporation purchased Sanderson Specialty Steels of Canada. Two years later union workers rejected a company contract offer, continuing to work.
William Roberts and Company (later William Roberts and Sons) of Phoenix Foundry in Nelson, Lancashire, England, produced many of the steam engines that powered cotton weaving and spinning mills of Pendle and neighbouring districts. [1] Industrial historian Mike Rothwell has called Phoenix foundry “Nelson’s most significant engineering site ...
The house was situated next to William Jessop’s works, the company, taking the name of the partners, being known as Mitchell, Raikes and Jessop. With expanding markets in the United States, Thomas and his brothers joined the business in 1830 and just two years later the small crucible steelmakers became William Jessop & Sons.
The crucibles were made by firing kaolinitic clay at temperatures greater than 1100°C, forming mullite. Mullite is an aluminum silicate only described in the 20th century and is responsible for the excellent properties of the Hessian crucible. [1] [2] Main production centre of the Hessian crucibles was the village of Großalmerode.
Eventually, after many experiments, Huntsman was able to make satisfactory cast steel, in clay pot crucibles, each holding about 34 pounds (15 kg) of blistered steel. A flux was added, and they were covered and heated by means of coke for about three hours. The molten steel was then poured into moulds and the crucibles reused.
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