This text contains 73 schemes of statically definable trusses, including girder trusses, frames and arched trusses, solutions for many of which have not been widely published. Among these, it is possible to separately distinguish trusses with externally hidden but dangerous properties. The book will appeal to both practical engineers and theorists of structural mechanics. It provides a number of compact and easily reproducible formulas that can be used both as a test and as reliable additions to numerical calculations. These formulas are especially effective for trusses with a large number of panels, where numerical calculations are either inaccurate or require considerable counting time.