Engineers and 
draftsmen use the 
drawing board for making and modifying drawings on paper with ink or pencil. Different drawing instruments (
trisquare[?], 
protractor[?], etc.) are used on it to draw parallel, perpendicular or oblique lines. There are instruments for drawing circles, arcs and other curves too (
compass, 
french curve[?], etc). 
Also known as a drafting table, or draughting table.
All Wikipedia text 
is available under the 
terms of the GNU Free Documentation License