MISCELLANEOUS TOOLS AND METHODS OF WORK 45 
Drawing Board 
Drawing Paper 
Fie. 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 D. 
In making drawings of this kind the greatest accuracy 
is required and special instruments are necessary. 
The drawing board on which the paper is 
Mim] fastened must be perfectly flat, with one of 
I its edges straight. 
| Fig. 60. The T Square 
Ril The T square is used for guiding the pencil 
or pen when drawing horizontal lines. 
The two triangles ¢¢ (Fig. 59) are used for drawing 
vertical and oblique lines, and a pair of compasses is 
