The book "Tables of coordinates of radii of curvature and radii-vectors of points of evolution for wheels with numbers of teeth from 12 to 120" by Yastreb B. M. is a unique publication that will become an indispensable assistant for engineers, designers and students studying mechanical engineering and mechanism theory. This is a specialized manual that collects extensive tables that allow you to quickly and accurately determine the radii of curvature and radii-vectors for gears, making it an important tool for the design and analysis of various mechanisms. The main purpose of the book is to facilitate the design process of gears, providing readers with ready-made solutions and data that can significantly reduce the time for calculation. It contains tables covering a range of teeth from 12 to 120, making it relevant for a wide range of applications. The reader will be able to easily find the necessary parameters for a specific number of teeth, which is especially important in conditions where accuracy and speed are crucial. The book will be of interest not only to professional engineers, but also to students of technical specialties who are just beginning to master the basics of designing gear mechanisms. It will be an excellent addition to the training materials and will help to better understand the theoretical aspects related to the curvature and geometry of the gears. In addition, this edition will be useful for teachers who can use it as a reference material in the classroom. The topics raised in the book cover important aspects of mechanics and design, including curvature, geometry, and the interaction of teeth. Yastrebov pays attention to both theoretical foundations and practical applications, which allows readers not only to assimilate the material, but also to apply it in practice. The book demonstrates how important accuracy in calculations and how the slightest deviations can affect the operation of the mechanism as a whole. The author's style is distinguished by clarity and accessibility, which makes complex technical concepts understandable even for beginners. Hawks In. M. He is known for his attention to detail and his desire for accuracy, which is evident in every table and every calculation. His previous works are also devoted to mechanics and design, and each of them is distinguished by high quality of presentation and depth of analysis. The book "Tables of coordinates of radii of curvature and radii-vectors of points of evolution for wheels with numbers of teeth from 12 to 120" is not just a reference book, but a full-fledged educational resource that will help readers to deepen their knowledge and skills in the field of mechanics. It will become a reliable assistant in complex calculations and design, as well as a source of inspiration for those who strive for excellence in their professional activities. If you are looking for information on gear design, radii of curvature, or just want to expand your knowledge of mechanics, this book is your ideal choice. Do not miss the opportunity to take a step towards professional growth and improvement of your skills with this unique edition