Tipping thermometer - Tentō ondōkei

Japanese: 転倒温度計 - てんとうおんどけい
Tipping thermometer - Tentō ondōkei
A special thermometer used to measure the temperature of deep water layers in oceans, lakes, and other bodies of water. It is lowered to the desired depth and left for about five minutes, after which a messenger is dropped along the cable from the ship to tip the thermometer over and pull it up. When it is overturned, the mercury column breaks and it is pulled up while maintaining the water temperature reading. It is often combined with a water sampler.
→ Related items Marine instruments

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
海洋や湖沼などで水中深い層の水温を測るのに用いる特殊な温度計。目的の深さまで降ろし,5分ぐらい放置したのち船上からケーブル沿いにメッセンジャー(使錘)を落下させ温度計を転倒させて引き上げる。転倒させると水銀柱が切れ水温示度が保持されたまま引き上げられる。採水器と組み合わせてある場合が多い。
→関連項目海洋測器

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