2
Symbolic Lines and Lettering
OBJECTIVES
After studying this chapter, you will be able to
Identify various types of lines and what they represent in engineering drawings and draw them
Identify the symmetry of an object
Show alternate positions like ON and OFF taken by a machine part (such as a switch or an operating lever) on a drawing, and also indicate the path taken while the part moves from one position to another
Identify various types of lettering and specify their use
2.1 INTRODUCTION
Lines can be considered to be letters in the language of engineering drawing. They enable a person to describe the external as well as the internal features of an object. As each symbolic line in the drawing represents a particular aspect, it is ...
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