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© F tO GP ve. 96%, , , , Drawing board (Fig 1): Drawing board is one of the main, equipment of Draughtsman. It is used for supporting the, drawing paper/tracing paper for making drawings. It is, made of well seasoned wood strips of about 25 mm thick, or masonite, free from knots and warping. It should be, softer enough to allow insertion and removal of drawing, pins. Two battens are fastened to the board by screws, in, slotted joints. They prevent warping and atthe same time, permit expansion and contraction of the strips due to the, change of moisture in the atmosphere., , , , Fig 1, , , , DRAWING BOARD, , , , , , —£DN120511, , , , One of the shorter edges of the drawing board, is provided, with an “ebony edge” (hard wood) fitted perfectly straight., , Standard drawing boards are designated as follows as per, 1S:1444-1989., , , , , , SI. No. Designation Size (mm), 1 DO 1500 x 1000 x 25, 2 D1 1000 x 700 x 25, 3 D2 00 x 500 x 15, 4 D3 500 x 350 x 15, , , , , , , , , , The working edge (ebony) must be straight., , Now-a-days the drawing boards are available with laminated, surfaces. The flatness can be checked by placing a, straight edge on its surface. If no light passes between, them, the surface is perfectly flat., , cS, , Upload to OneDrive