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电磁海流計是美国研制的一种仪器。日本海上保安厅航海部和理化所也进行了研制。一九五三年日本气象厅保安厅等一些观測船只上,使用了这种仪器。在沒有这种仪器前,测定海流是应用漂流物或利用船的漂移,或停船采水测定海水溫度、盐度的力学剖面。既使应用流速計等有关仪器,也必須停船測定。因此,这样測定,即需要时間較长,也浪費人力。更困难的是在茫茫的大海很难找到一个固定的标准点。
Electromagnetic current meter is an instrument developed by the United States. Japan Coast Guard Nautical Division and the Physical and Chemical Institute has also been developed. In 1953 some observation vessels such as the Security Agency of Japan Meteorological Agency used such instruments. In the absence of such instruments, the determination of current is the application of drifting or the use of ship drift, or stop pumping water to determine sea water temperature, salinity of the mechanical profile. Even if the application of flow meters and other related equipment, but also must stop measuring. Therefore, this determination, which takes a long time, but also a waste of manpower. More difficult is in the vast ocean is hard to find a fixed standard point.