Science: Radiation v. Fog

If they had an apparatus which would show, on a sort of artificial horizon, every object for a mile around, together with its distance and direction, ship captains nosing uneasily ahead through a fog would be much safer and happier. So far such a mariner's boon has not appeared. Yet it seems to be on the way, because the problem is simply one of technical ingenuity in applying principles already understood.

Visible light does not penetrate thick fog, but visible light is only a small segment on the wide spectrum of electro-magnetic radiation....

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