翻訳と辞書 Words near each other ・ Churk Muzan ・ Churl ・ Churm ・ Churma ・ Churmaq ・ Churmaq, Kabudarahang ・ Churmaq, Razan ・ Churmian railway station ・ Churmuri ・ Churn ・ Churn (Seven Mary Three album) ・ Churn (Shihad album) ・ Churn and burn ・ Churn Creek ・ Churn Creek Protected Area ・ Churn drill ・ Churn railway station ・ Churn rate ・ Churn turbulent flow ・ Churna ・ Churna Island ・ Churnalism ・ Churnet Valley Line ・ Churnet Valley Railway ・ Churni (disambiguation) ・ Churni Ganguly ・ Churni River ・ Churning (butter) ・ Churning (cipher) ・ Churning (finance) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Churn drill ： ウィキペディア英語版 Churn drill The churn drill is a large drilling machine that bores large diameter holes in the ground. In mining, they were used to drill into the soft carbonate rocks of lead and zinc hosted regions to extract bulk samples of the ore. ==History== Churn drills were invented as early as 221 BC in Qin Dynasty China, capable of reaching a depth of 1500 m.〔 Churn drills in ancient China were built of wood and labor-intensive, but were able to go through solid rock. The churn drill was transmitted to Europe during the 12th century. A churn drill using steam power, based on "the ancient Chinese method of lifting and dropping a rod tipped with a bit," was first built in 1835 by Isaac Singer in the United States, according to ''The History of Grinding''. In America, they were common in the Tri-State areas during the lead and zinc mining in Missouri, Oklahoma, and Kansas. There is an example of one of these machines at the Northern Life Museum in Fort Smith, Northwest Territories, Canada. It was used in 1929-1930 at the Pine Point lead and zinc mine in the Northwest Territories. 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「Churn drill」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.