How Two Boys Made Their Own Electric Device: Complete Instructions for Making All Kinds of Simple Electrical Learning Devices by St. John, Thomas M. (Thomas Matthews) is an exciting book that reveals the secrets of making your own electrical devices . The book contains detailed and clear instructions for making various devices for studying the basics of electricity. The authors explain in detail the process of creating simple electrical devices, which allows readers not only to familiarize themselves with the theoretical aspects of electricity, but also to apply this knowledge practically. This book will be an excellent addition to anyone who is interested in electricity and wants to deepen their knowledge in this field.