GARDEN CITY - Adelphi University will unveil a special art exhibit Friday marking the 100th anniversary of the deadly fire at the Triangle Shirtwaist Factory in Manhattan. Just around closing time on March 25, 1911, a fire swept through the Triangle Shirtwaist Factory, trapping and killing 146 workers, most of them young immigrant women. Adelphi University professor Rob Linne wrote a book about the fire and helped put together the exhibition. The Triangle fire set into motion radical changes, helping improve workers' rights and adopting new industrial and fire safety rules in New York and then the rest of the U.S.Exhibit curator Claudia Lemlich says her relative, Clara Lemlich, was a union organizer who witnessed the fire's aftermath, which gave her an impetus to close sweatshops in the city. Thousands are expected to attend a memorial that will be held Friday at the site of the fire in Greenwich Village.