The aim in preparing this little manual has been to make it a guide for the apprentice journeyman and master sheet metal worker. To this end the author collected everything of value on the subject and then boiled it down to a well arranged series of simple problems on the different phases of pattern drafting which the mechanic has to puzzle over daily. The section on Mensuration will be found both accurate and complete and the rules and examples are reduced to the plainest language so that any one may understand them. Realizing the value of reliable data he included all the tables of weights of materials measures of area capacity etc. to which the sheet metal worker has occasion to refer together with many excellent recipes formulas and rules which will be found of great service. The present edition has been carefully edited and revised by William Neubecker expert pattern cutter and instructor at the New York Trade School. While the greater portion of the work remains intact quite a number of important changes have been made to insure greater accuracy and many simpler methods have been included.