In order to effect the best means for stable field observation of current, the new current-meters of all-direction-type have been constructed. Several tests have been made for the best probe available.
　In view of the results so far achieved, it has been proven that the current-meters of all-direction-type give sufficient response and stability to reliable measurement of velocity from 4 to 400cm/sec of all-direction.
　Using the type of current-meters, routine observation is now being continued at points of 1m, 3m, 5m, 10m, and 15m depth of water at Daini Kaiho in Tokyo Bay.