A textbook on sheet metal pattern drafting

The Bound Volumes of the Sheet-Metal Pattern Drafting Course contain twenty two Instruction Papers. The subject of sheet-metal pattern cutting is here, for the first time, treated in an exhaustive and comprehensive manner. Beginning with the elementary processes of Arithmetic, the subjects of Geometry and Mensuration are unfolded to the student in a gradual manner, while the application of these subjects to the practical needs of the trade worker is made so obvious that the workman cannot fail to derive the utmost benefit there from. These Volumes, therefore, will make a desirable addition to any sheet-metal worker's library, and will serve as an admirable work of reference. The Instruction Papers in pamphlet form may be conveniently kept in the tool-box at the shop; the numerous tables, rules, and constructions will then be within easy reach when needed.

The method of numbering the pages, cuts, articles, etc. is such that each paper and part is complete in itself; hence, in order to make the indexes in the Bound Volumes intelligible, it was necessary to give each paper and part a number. This number is placed at the top of each page, on the headline, opposite the page number; and to distinguish it from the page numbers it is preceded by the printer's section mark.

The Examination Questions and the Keys are given the same section numbers as the Instruction Papers to which they belong, and are grouped together at the end of the first volume. Examination Questions and Keys are provided only for the first twelve sections. Reduced copies of the Drawing Plates that accompany the later sections of the Course are inserted as folders throughout the text of the respective sections to which they refer.

The first volume contains twelve sections on arithmetic and mensuration in which the fundamental operations needed by the pattern draftsman in his calculations are fully, clearly, and concisely set forth ; a section on instrumental drawing in which instruments and their uses, together with the preliminary operations of the drawing board, are minutely explained; and a section on geometrical drawing in which the principles of geometry are illustrated in their practical applications to the wants of the pattern cutter.

The second volume contains eight sections, or Instruction Papers, which comprise the technical, or advanced, portion of the Course. In Practical Projection the subject of working drawings is very carefully explained and the student is taught both how to make and how to read mechanical drawings. Copious illustrations are given and no pains have been spared in order to make this subject clearly understood. In Development of Surfaces the forms drawn by the student in the preceding section are developed - that is, patterns, or lay-outs, for their surfaces are defined - and the student is here made familiar with the general principles that govern all sheet-metal pattern work. Practical Pat- tern Problems is here complete in three sections, much of the tabular matter which appeared in the first edition of the first section having been incorporated into the earlier mathematical portion of the Course. In these sections the practical applications of the draftsman's art to the sheet metal worker's trade are shown in an extended list of representative problems. These problems are grouped in such a manner that workmen engaged in the different branches of the trade may find their particular problems under separate headings, thus greatly facilitating the work of referring thereto. In Architectural Proportion the cornice maker and the architectural sheet-metal worker will find the classic orders carefully explained, and may easily ascertain by reference to the pages of this section, just what proportions to give any particular design they may be called on to construct. Development of Moldings contains explicit instructions for every conceivable form of cornice pattern. Miters of every variety are explained and the student is shown the shortest possible method of arriving at the exact lay-out. The section on Skylights contains accurate developments for skylight patterns in every form of bar. The usual constructions are given, and full-sized drawings may be made directly from the illustrations when required.

All these papers have been prepared with especial reference to their practical utility; they are complete and concise, and have been suited to the needs of the sheet-metal worker - they contain nothing that is not of real value to him. No unnecessary operations are shown, and in every case the shortest and most practical methods have been adopted. These papers have been prepared by our own experienced mathematicians and sheet-metal experts; they contain such tables of weights, measures, dimensions, etc. as are needed by the mechanic when he is called on to estimate the costs and capacities of various articles. The entire Course is directly suited to the needs of the practical pattern cutter.