The e.m.f. produced in the sea by water movement has been measured over two tidal periods in shallow water. Simultaneous measurements of the drift of the ship towing the electrodes provide a means of calibrating the apparatus. The results are compared with existing tidal stream data.
Vaux, David. 1955. "Current measuring in shallow waters by towed electrodes." Journal of Marine Research 14, (2). https://elischolar.library.yale.edu/journal_of_marine_research/829