Author IJzebrand Schuitema owns one of the largest slide rule collections in the world. In the course of his collecting, he came upon rules that were unknown to him and that excited his curiosity. This book is a compilation of the articles he wrote about these wonderful slide rules, each one made for a specific and unique use, and about the men who designed and manufactured them. There is the slide rule that computes road curvature, one that calculates for sewerage applications, one that provides navigational information for flyers, one for brewers that computes barley malt, water, hops, and yeast and then takes into account time, temperature and pressure and there are many, many more. Ir. Schuitema was fortunate to have as his associate in this enterprise Herman van Herwijnen, who describes himself as a slide rule collector and computer freak. He has compiled a marvelous CD, designed for the PC and included with the book, featuring an enormous number of photographs (in full color and from all sides and angles) of all the rules mentioned in the book, as well as a great many additional ones. Each rule is accompanied by a description material it is made of, size, name, etc. Each picture can be enlarged several times, so that every detail is seen. The disc can be searched, browsed, its index can be used to take the reader to a particular slide rule maker or to a particular slide rule, and individual pictures can be printed or copied ? it is a treasure chest of information.