. Industrial Education Magazine . illustrations—$ Ellsworth M. Longfield Head of Sheet Metal Deft. Boston Trade School The underlying principles of sheet metalpattern drafting CONTENTS I.—Rectilinear Figures. II.—Wired Cylinders. III.—Cylinders Cut by Planes. IV.—Intersecting Cylin-ders. V.—Cones of Revolution. VI.—Intersecting Rec-tangular Prisms. VII.—Planning for Quantity Pro-duction. VIII.—Sections Formed by Cutting —Frustums of Rectangular Pyramids. X.—Com-binations of Various Solids. XI.—Frustums of —Return and Face Miters. XIII.—Triangulationof Scalene Cones. X


. Industrial Education Magazine . illustrations—$ Ellsworth M. Longfield Head of Sheet Metal Deft. Boston Trade School The underlying principles of sheet metalpattern drafting CONTENTS I.—Rectilinear Figures. II.—Wired Cylinders. III.—Cylinders Cut by Planes. IV.—Intersecting Cylin-ders. V.—Cones of Revolution. VI.—Intersecting Rec-tangular Prisms. VII.—Planning for Quantity Pro-duction. VIII.—Sections Formed by Cutting —Frustums of Rectangular Pyramids. X.—Com-binations of Various Solids. XI.—Frustums of —Return and Face Miters. XIII.—Triangulationof Scalene Cones. XIV.—Triangulation of TransitionPieces. XV.—Developments by Sections. XVI.—Developed and Extended Sections. McGRAW-HILL, BOOK CO., Seventh Ave., New York You may send me on 10 days approvalLongfields SHEET METAL DRAFTING $ agree to pay for the book or return it,postpaid, within 10 days of receipt. Signed School Official Position Address M. T. M. 5-1-21 XXVII TOOLS BENCHES wHARD WARE ;. Hammacher, Schlemmer &. Co. NEWYOHK,SINCBJ*«a 4>» AVE. &.1J™ STREET e - _^_i_^> GOOD TOOLS ARE ESSENTIAL FOR GOOD WORK Since 1848 we have adhered toone policy—to handle only the verybest in quality. Our 300 page catalog illustratedabove is of particular value to thoseinterested in manual or vocationaltraining. If you havent a copyask for Catalog No. 224. HAMMACHERSCHLEMMER & CO. Hardware, Tools and Supplies New York, Since 1848, 4th Ave. and 13th St. e« JORGENSEN Peerless Hand Screws are not only Ad-justable but excelon ordinary straightwork. Steel Spindles Steel Nuts Hard Maple Jaws AdjustableClamp Co. 216 St., Chicag


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