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A Mason jar is a molded glass jar used in home canning to preserve food. The mouth of the jar has screw threads on its outer perimeter to accept a metal ring (or "band"). The band, when screwed down, presses a separate stamped steel disc-shaped lid against the rim of the jar. An integral rubber ring on the underside of the lid creates a hermetic seal to the jar. The bands and lids usually come with new jars, and bands and lids are also sold separately; while the bands are reusable, the lids are intended for single use when canning. While largely supplanted by other methods, such as the tin can and plastic containers, for commercial mass production, they are still commonly used in home canning. The Mason jar was invented and patented in 1858 by Philadelphia tinsmith John Landis Mason〔("Reports of Cases Argued and Determined in the Circuit Court of the United States for the Second Circuit: 1845–1887" ) By Samuel Blatchford, United States Circuit Court (2nd Circuit). Published by Derby and Miller, 1875. Retrieved October 22, 2008〕 (1832–1902). Among other common names for them are Ball jars, after Ball Corporation, an early and prolific manufacturer of the jars; fruit jars for a common content; and simply glass canning jars reflecting their material. ==The jar== Mason jars are made of soda-lime glass and in the U.S. come in regular mouth inner (outer ) diameter or wide mouth inner (outer ) diameter and a variety of volumes including cup (half-pint), pint, quart, and half-gallon. The most common U.S. brands of Mason jars are Ball, Kerr and Golden Harvest. All three are now part of the Jarden corporation based in Boca Raton, Florida.〔"After years of moving its employees south, Jarden Corp. has officially switched its headquarters to Boca Raton to give the city another major corporate player to boast about." Bandell, Brian. Company with $7B in sales now calls Boca Raton home. 13 March 2014. Accessed February 2015 at http://www.bizjournals.com/southflorida/news/2014/03/13/company-with-7b-in-sales-now-calls-boca-raton-home.html〕 In Canada, Bernardin, another division of Jarden, is the most common brand; Jarden's Golden Harvest is also available. Jarden offers its Canadian jars in metric volumes of 125ml, 250ml, 500ml and 1 litre. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mason jar」の詳細全文を読む スポンサード リンク
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