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เนื้อหาย่อ : This basic text provides instructional material for students, apprentices, craftsmen, and others in the machine and allied trades, who need to know how to read and interpret industrial blue prints without laboriously learning how to make mechanical drawings or master drafting techniques. The text is divided into a series of twenty instructional units graded in a logical order of learning diffculty. These units range from simple to complex and are numbered in sequence starting with unit one. Each of the twenty industrial jobs involves the application of drafting fundamentals, drafting room symbolism as recommended by the American Standards Associ- ation, and terminology most frequently used in the Machine Trades. The three parts to each of the selected twenty units include a Trade Theory sheet, an accompanying Job Sheet, and an Assignment Sheet for the unit. A brief description giving the purpose of each part follows. Trade Theory Series The principles of drafting theory, and the related technical information needed to in- terpret the new material which is included on the Job Sheet, are covered in an information sheet called Trade Theory. The Trade Theory Series also serves as a reference for the student by supplying him with drafting room techniques and shop information needed to read industrial blue prints. Job Series The Job Series consists of a number of typical shop blue prints which are grouped so as to cover drafting practices dealing with three view drawings, two view drawings, one view draw- ings, sectional views, screw threads, and summary problems covering all of these fundamentals. Assignment Series The trade theory is applied on the job sheet which accompanies it in each case. The sheets in the Assignment Series which follow contain a list of questions to supplement the instruction given on how to read blue prints. The Assignment Series is intended to develop an ability to read blue prints for required dimensions, shape description, machining operations, and other data which may be required in the fabricating, constructing, assembly, and operating of parts and units. Constant application is made of basic principles of mathematics which must be used daily in the solution of common shop problems. Sketching Assignments The free-hand sketching assignments which follow many of the jobs are included for two reasons: first, to teach the student to apply certain principles of projection and other drafting practices; and second, to develop an ability to make simple sketches on the job without using instruments.