"The Steel Square" “ it’s Use and Mechanism” by Harold Ryder, published by Caxton Publishing Company LTD, is a paperback book that delves into the subject of the steel square and its use and mechanism. With a focus on the practical applications of the steel square, this book is likely to be a valuable resource for those interested in the intricacies of this essential tool. The author's expertise and detailed explanations will guide readers through the various uses and techniques associated with the steel square, making it a must-have for anyone looking to improve their knowledge and skills in this area."