Rock (Sink) - Rock (English) lead

Japanese: いわ(沈子) - いわ(英語表記)lead
Rock (Sink) - Rock (English) lead
A weight used to pull fishing nets downward and maintain a desired shape underwater. It is also used to secure fishing nets to the seabed. It is also called a sinker, sinker, or sinker. The primary requirement for a material is a high sinking force, but it must also be durable, easy to process, and abundant and inexpensive. Lead, iron, stone, pottery, and concrete have long been used. Bales or bags filled with sand, gravel, and stones are also used to secure fixed nets.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
網漁具を下方に引っぱり,水中で所要の形状を保たせるために用いられるおもり。網漁具を海底に固定するためにも用いられる。おもり,しずみ,ちんしなどともいう。沈降力が大きいことが材料の備えるべき第一条件だが,こわれにくいこと,加工が容易なこと,供給が豊富で安価なことも必要である。鉛,鉄,石,陶器,コンクリートなどが昔から用いられている。また定置網を固定する際のように,俵や袋に砂,砂利,石などを詰めたものも用いられる。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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