Abstract
SUPPOSE a weir, AB, across a river, and first let it be at right angles to the direction of the current. Suppose a man in the stream above the weir, nearer to B than to A. Let O be his position, and OX a perpendicular on AB. Then he cannot escape if his velocity, v, is <BX/OB u, where u is that of the stream. If his full speed has this critical value, or if there is any uncertainty about his safety, he must swim at right angles to OB.
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MORLEY, F. A Rule for escaping a Danger. Nature 35, 345 (1887). https://doi.org/10.1038/035345c0
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DOI: https://doi.org/10.1038/035345c0
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