Beginning with a general discussion of the uses and kinds of blueprints, the text explains the language of a blueprint--lines, sections, symbols, dimensions, conventions, notes, and titles. Technical sketching is described and illustrated. Ways are suggested by means of which anyone can produce correct and attractive sketches. The sections on wiring and schematic diagrams are fairly extensive in accordance with the increased training demands in electrical and electronic equipment and in order to acquaint operating personnel more rapidly with the symbolic notation now being standardized throughout the armed services. Sections on welding, structural, and architectural symbols are included to help the ratings concerned with these subjects and to introduce them to standards now established in these fields. An index, a list of useful references, and a list of abbreviations are included as aids to the trainee using this book.