National Geographic : 1943 Jul
Staff Photographer Willard R.Culver Antidote for U-boats, a Silvery Sentinel Guards Her Flock of Drab Merchantmen inaCoastwise Convoy Seen from the photographer's blimp, the convoy is proceeding at 10 knots, while the patrol airship hovers overhead. Shecircles and zigzags toprotect her charges. New Jersey's shore line lies in the distance. A fifth cargo ship and four warcraft are just out of sight. When thephotographer's blimp crossed a500-yard limit to get this shot, blinker lights of the patrol craft flashed warnings telling her to keep her distance (page 83).