A drawing paper of good quality and well-seasoned is to be used for plotting. It should be able to withstand the rubbing of the alidade. The effect of changes in humidity and temperature of the atmosphere should be minimum thus reduction in the expansion or contraction of the paper, and minimum alteration in the scale of the map and distortion in the plan.

A sharp, hard (4H or 6H) pencil is to be used for drawing lines. Soft pencils are used for lines to be erased.

A good quality rubber eraser is used for erasing the lines.

<< Back | Next >>