翻訳と辞書 Words near each other ・ Tough Love (Pulled Apart by Horses album) ・ Touchmate ・ Touchnote ・ Touchpad ・ TouchPal ・ Touchpaper ・ Touchpaper (Claire Hamill album) ・ Touchphone ・ Touchpoint ・ Touchpress ・ Touchscreen ・ Touchscreen remote control ・ Touchstone ・ Touchstone (album) ・ Touchstone (As You Like It) ・ Touchstone (assaying tool) ・ Touchstone (band) ・ Touchstone (horse) ・ Touchstone (magazine) ・ Touchstone (metaphor) ・ Touchstone (US-Irish band) ・ Touchstone Academy ・ Touchstone Energy ・ Touchstone file ・ Touchstone Game Reserve ・ Touchstone Pictures ・ Touchstone Semiconductor ・ TouchStone Software ・ Touchstone Theatre ・ Touchstones Rochdale 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 Touchstone (assaying tool) ： ウィキペディア英語版 Touchstone (assaying tool) A touchstone is a small tablet of dark stone such as fieldstone, slate, or lydite, used for assaying precious metal alloys. It has a finely grained surface on which soft metals leave a visible trace. ==History== The touchstone was used in ancient Greece. Its role in the introduction of monetary economy was explored by science historian James Burke in the second episode of his 1978 BBC television series ''Connections''. It was also used by the Indus Valley Civilization about 3500 BC for testing the purity of soft metals. 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「Touchstone (assaying tool)」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.