The author, Albert Pardini, was in charge of a bombsight repair and modification facility all through the war and continued his interest by collecting various models and accssories. He spent the last nine years reading all the material in the several archives in the U.S. and then weaving the bits and pieces to produce this history of the Norden sight. He starts with a laymen's look at the bombing problem, various approaches to solving it and follows the history of the sight from 1922 through 1945. Although frustrated by large gaps in the available material, he was able to put together an array of details no where else to be found. It is not a literary masterpiece but does present without the usual hype and a great amount of detail.