MISC KLL A. \KOUS TOOLS AND METHODS OF WORK 45 



FIG. 59. Drawing Board showing T Square and Triangles in Position 



The complete working drawing of this joint, with all 

 the necessary dimensions, is shown at b. 



In making drawings of this kind the greatest accuracy 

 is required and special instruments are necessary. 



The drawing board on which the paper is 

 fastened must be perfectly flat, with one of 

 its edges straight. 



H.5.&CO 



FIG. GO. The T Square 



The T square is used for guiding the pencil 

 or pen when drawing horizontal lines. 

 The two triangles 1 1 (Fig. 59) are used for drawing 

 vertical and oblique lines, and a pair of compasses is 



