This textbook covers the subject of vocational mathematics. This course may take the place of the first year algebra and the first year geometry in vocational classes in which it is not desirable to give the traditional course in algebra and geometry. This book may be used by the regular teacher in mathematics and by the shop teacher. It can be used in the shop in teaching mathematics and in providing drill problems upon the shop work. A course based upon the contents of the book should be provided before pupils finish their training, so that they may become skillful in applying the principles of mathematics to the daily needs of manufacturing life. Carpentering and building, sheet metal work, fasteners, pulleys, gears, plumbing and hydraulics, steam engineering, electrical work, machining, and textile work are covered.