 One of Chapin's most celebrated coups was the publication of a photograph captured by an "Evening World" photographer showing the moment when New York mayor William Jay Gaynor was shot by a would-be assassin.William Warnecke, the photographer, who had been lining up a portrait of the mayor, snapped the shutter just as Gaynor crumpled to the ground; Chapin's response, when the developed photo arrived on his desk, was