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Our world has become one where computers are used to solve many problems quickly and accurately. We use calculators to solve arithmetical problems, word pro-cessors to check spelling and grammar in texts and computer-aided design (C.A.D.) programs to do much of our drawing for us. However, in the same way that we need to know what  ϩ ,  Ϫ ,  ϫ  and  ÷  mean when we press that symbol on a calculator, and we need to be able to write a text before we can ask a word processor to check it, in the same way we need knowledge and understanding of geometric and engineering drawing before we can use computers   to help us with design. These understandings can come through studying and using this book.  This   third edition starts with and introduces the tools needed for technical draw-ing, with some basic exercises that will help you to practise these skills. Part 1 is   almost unchanged from earlier editions. It shows specific drawing solutions to many geometric problems. Part 2, engineering drawing, has been updated to the lat-est recommendations in BS 308, the British Standards Institution publication about engineering drawing practice. There is a new Appendix C, which shows the recom-mendations given in BS 308 for the simplified representation of threaded fasteners.  Finally   there is a chapter that lists the types of questions that need to be asked when creating a design. It then lists the questions that can be answered in this book and guides you to the appropriate chapter.  However   carefully one checks a manuscript, errors creep through. I shall be very grateful if any readers who find errors let me know through the publishers.

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