This early 20th-century technical manual was published by the International Textbook Company as part of the International Correspondence Schools (I.C.S.) curriculum. It serves as a comprehensive instructional guide covering arithmetic, algebra, mechanics, and hydraulic machinery, representing the foundation of industrial-era distance learning. The book is in fair vintage condition, showing substantial wear to the leather-bound spine and corners, including scuffing and small losses to the material. A notable water stain affects the front endpapers and title page, accompanied by general foxing, but the internal pages remain secure and the technical content is fully readable.