One of the scriber's arms holds the pen or the pencil, and the other two
arms have tracer points. The tail pin moves along the straight groove on
the template, while the tracing pin moves in the engraved characters on
template (figure 1-71). When you move the tracing pin around the contour
of a character on the template, the entire scriber hinges on the tail pin
in the groove on the template, and the pen or pencil duplicates the
character you traced on the drawing surface.
The scriber has an adjusting screw next to the pen point (figure 1-71).
The adjusting screw controls how much pressure or contact the pen point
makes on the drawing surface. You set the adjusting screw so the tip of
the cleaning pin just contacts the drawing surface. If the pen point
exerts too much pressure on the drawing surface, the pen grooves the
drawing surface and too much ink flows from the pen. The letters also
have a tendency to run and smear. Additionally, you can adjust the slant
of the characters up to 22 1/2 by adjusting the scriber's tracer arm.