Paragraph 8. It is sometimes quite convenient to gauge lines without the use of a ruler or marking gauge, but simply by the use of the pencil and fingers. This is particularly true in gauging lines which are a short distance from the working edge, as in laying out a chamfer. To do this hold the pencil and material as shown in Figure 25, allowing the second finger to drag against the working edge of the material, serving the same purpose as the head of the marking gauge, while the thumb and forefinger hold the pencil rather rigidly, thus causing it to make a line equally distant from the working edge as it is being drawn along on the material. In this process the pencil may be either pushed or pulled. It requires a little practice to be able to do this skillfully, but when the skill is once acquired it is a great convenience.