Ocean currents are difficult to clock. The standard method is to measure the distance that a ship moves through the water and compare it with the distance it moves across the bottom of the sea, as shown by celestial observations. Any difference between the two figures is attributed to a current that helped or hindered the ship. The trouble with this system is that it gives only average current velocities over considerable distances and periods of time.
Last week the research ship Albatross of the Woods Hole (Mass.) Oceanographic Institute returned from a 22,000-mile...
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