A practical workshop companion for tin, sheet iron, and copper plate workers : containing rules for describing various kinds of patterns used by tin, sheet iron, and copper plate workers; practical geometry; mensuration of surfaces and solids; tables of the weights of metals, lead pipe, etc.; tables of areas and circumferences of circles; japans, varnishes, lackers, cements, compositions, etc., etc., etc. / by Leroy J. Blinn, master mechanic - Blinn, Leroy J.