Part of the Arsenal of Democracy panel designed by Jean Carlu, eminent poster artist, for the Office of Emergency Management (OEM) and seen first at the National and Civilian Defense Exposition in New York's Grand Central Palace. Mr. Carlu, in shirtsleeves, is explaining his new technique in photomontage while the panel, which will measure 15 x 30 feet, awaits assembly. The Arsenal of Democracy and a panel representing the Four Freedoms, of equal size, will be showing in several other cities after the close of the New York show