Magnetic steel piece - magnetic link

Japanese: 磁鋼片 - じこうへん（英語表記）magnetic link

A device that records the magnitude of the lightning current generated by a lightning strike. Magnetic steel, the same material used to make permanent magnets, is cut into strips and wrapped in insulation to form a cylinder about 1 cm in diameter and 5 cm in length, although some are even smaller. These are installed near lightning rods or transmission towers. When a lightning current flows, the magnetic field magnetizes the magnetic steel, so the magnitude of the lightning current can be determined by measuring the residual magnetism of the magnetic steel piece later. Japan has suffered from lightning damage since the start of the electric power industry, but in 1932 magnetic steel pieces were invented in the United States, and their simplicity allowed many actual measurements of lightning current to be obtained, contributing to the advancement of lightning-resistant design for power transmission lines.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

落雷によって発生する雷撃電流の大きさを記録する装置。永久磁石を作るのに用いられる磁鋼材を細長く切り絶縁物で包んだ円柱形で，直径1cm，長さ5cm程度，もっと小さいものもある。これを避雷針や送電線の鉄塔などの近くに設置しておく。雷撃電流が流れるとその磁界によって磁鋼材が磁化されるので，あとから磁鋼片の残留磁気を測れば雷撃電流の大きさを知ることができる。　電力事業開始以来，雷害に苦しめられてきたが，1932年に磁鋼片がアメリカで発明され，その簡便さから多数の雷撃電流の実測値が得られ，送電線の耐雷設計の進歩に貢献した。

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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