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An iron ring is an item of laboratory equipment which comprises a conjoined metal ring and radially-extending rod.〔(【引用サイトリンク】title=Tutorial on Supports )〕 In some cases, the rod terminates in a screw clamp for attachment to a retort stand or other support; in others, the rod may be attached to a stand by means of a laboratory clamp holder.〔(【引用サイトリンク】title=Holder )〕 Iron rings are commonly used in chemistry laboratories for supporting apparatus above the work surface, for example: * a tapered item such as a filter funnel or separatory funnel. * a clay triangle,〔 which itself supports an item such as a crucible. * a wire gauze,〔 which itself supports a flat-bottomed beaker or conical flask. * a large, and therefore heavy, round-bottom flask. In some cases, a slot is cut in the side of the ring opposite the rod. This is to allow a funnel to be placed upon and removed from the ring from the side rather than from above, a safer procedure. ==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「Iron ring (laboratory)」の詳細全文を読む スポンサード リンク
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