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Edison Portland Cement Company
The Edison Portland Cement Company was a venture by Thomas Edison that helped to improve the Portland cement industry. Edison was developing an iron ore milling process and discovered a market in the sale of waste sand to cement manufacturers. He decided to set up his own cement company, founding it in New Village, New Jersey in 1899, and went on to supply the concrete for the construction of the Yankee Stadium in 1922.
==Beginnings==
In 1881 Edison formed the Edison Ore-Milling Company, and tried for many years to make that business a success. The demand was not there though and despite the new technological innovations that Edison brought to the industry the company could not compete with the operations in the Midwest.〔(The Life of Thomas A. Edison ). American Memory. Accessed September 24, 2011.〕〔(Edison and Ore Refining ). IEEE Global History Network. August 3, 2009. Accessed September 24, 2011.〕 Despite continual investment, with Edison even selling the shares in General Electric, the company suffered huge losses. Eventually the ore-crushing technology was sold off to other mine owners.〔
The manufacturing process used by the Edison Ore-Milling Company produced a large quantity of waste sand which he would sell on to cement manufacturers. The properties of the fine sand were particularly suitable for concrete,〔(Thomas Alva Edison And The Concrete Piano ). ''American Heritage''. August/September 1980. Volume 31, Issue 5. Accessed September 25, 2011.〕 leading to a harder, more durable product. In 1899, Edison decided to join the cement business, reusing some of the technology he had developed for ore-milling.〔(Cement ), ''The Edison Papers''. March 31, 2010. Accessed September 24, 2011.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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