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Reed level
A reed level is an Arabic invention for determining level for the purpose of construction. A hole is put through a long straight reed and water is poured into the center. When the flow out of both sides is equal, the reed is level.〔"(Engineering in Arabic-Islamic Civilization )", Donald R. Hill and Ahmad Y. al-Hassan〕 The device serves the same purpose as a spirit level. ==References==
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「Reed level」の詳細全文を読む
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