The study of the parameters of cracks in the walls of the waveguide: method. Instructions to the laboratory. work No3 in the disciplines "Electrodynamics" by B. B. Kirilchuk is a unique textbook that will become an indispensable assistant for students and teachers engaged in the study of electrodynamics and related disciplines. In this edition, the author examines in detail the key aspects related to the study of waveguides, their parameters and features, which makes it relevant for both beginners and more experienced specialists in the field of physics and engineering. The book immerses the reader in the world of electromagnetic waves and waveguides, revealing the secrets of their interaction and behavior in various conditions. In. B. Kirilchuk, possessing deep knowledge and experience in this field, offers readers methodological guidelines that will help not only in carrying out laboratory work, but also in understanding the theoretical foundations underlying electrodynamics. The book is filled with practical examples and experiments, which makes it especially valuable for technical students seeking not only to master the theory, but also to apply it in practice. The topics raised in the book cover a wide range of issues, such as the analysis of slit parameters in waveguide walls, the effect of these parameters on wave propagation, and methods of measurement and calculation. These aspects are an integral part of the study of electrodynamics and are used in various fields of science and technology, including radio communication, optics and microwave technology. The book also addresses issues related to waveguide design and optimization, making it particularly useful for future engineers and researchers. Readers interested in physics, engineering, radio engineering, and related fields will find much useful information in this edition. The book will be useful to both students and teachers who are looking for high-quality teaching materials for the organization of the educational process . Thanks to a clear and accessible style of presentation, even complex topics become understandable and easily digestible. Style B. B. Kirilchuk is distinguished by scientific rigor and at the same time accessibility, which allows the reader to easily follow the author's thoughts. His other well-known works are also devoted to electrodynamics and radio engineering, which confirms his status as an expert in this field. Readers familiar with its previous editions will appreciate the consistency and depth of analysis that the author applies in this book. The book "Study of the parameters of cracks in the walls of the waveguide" will be an excellent addition to the library of every student and specialist working in the field of physics and engineering. It not only enriches knowledge in the field of electrodynamics, but also inspires new research and experiments. If you are looking for a quality guide that will help you understand the complex aspects of waveguides and their parameters, this book is your ideal choice.