Lines
Lines is one important aspect of technical drawing.  Lines are always used to construct meaningful drawings. Various types of lines are used to construct drawing, each line used in some specific sense.  Lines are drawn following standard conventions mentioned in BIS (SP46:2003). A line may be curved, straight, continuous, segmented. It may be drawn as thin or thick. A few basic types of lines widely used in drawings are shown in Table 1.  

Table 1. Types of letters used in engineering drawing.

 

Line Strokes
Line strokes refer to the directions of drawing straight and curved lines. The standards for lines is  given in  BIS : SP-46,  2003
Vertical and inclined lines are drawn from top to bottom, horizontal lines are drawn from left to right. Curved lines are drawn from left to right or top to bottom. The direction of strokes are illustrated in figure 1.

Figure 1. The line strokes  for drawing straight and curved lines.