The history of Lady Justice and scales is briefly sketched in a Thursday, December 16, 2010 New York Times article by Randy Kennedy. The article is a summary of a book by Yale Law School professors, Judith Resnik and Dennis Curtis titled "Representing Justice." The book is described as an academic treatise on "threats to the modern judiciary that doubles as an obsessive’s tour of Western art through the lens of the law – Lady Justice’s familiar blindfold did not become an accessory until well into the 17th century." A slide show is here.