Special Cased Instruments, Continued
CONTOUR PEN: A contour pen lends itself to freehand, curvilinear lines.
The pen nib swivels on a shaft inside a hollow handle. It draws sharp,
precise lines and the line width is adjustable.
Figure 2-32 shows a contour pen.
Figure 2-32. A contour pen with rotating handle.
RAILROAD PEN: Drawing parallel lines of equal or differing width is easy
with a railroad pen. Both nibs have adjustable widths. The nibs may or may
not rotate on a shaft inside a hollow handle.
Figure 2-33 shows a railroad pen.
Figure 2-33. A railroad pen with rotating handle.
When you use a ruling pen, maintain perpendicularity with the drawing
surface and draw the line with the pen at a 60-degree angle toward the
direction the line is being drawn. Clean the pens and wipe them with a light
oil cloth before you store them.
Figure 2-34 illustrates the drawing nib angle to paper.
Drawing lines with a
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