Special Cased Instruments, ContinuedRuling pensCONTOUR PEN: A contour pen lends itself to freehand, curvilinear lines.(Continued)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 easywith a railroad pen. Both nibs have adjustable widths. The nibs may or maynot 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 drawingsurface and draw the line with the pen at a 60-degree angle toward thedirection the line is being drawn. Clean the pens and wipe them with a lightoil cloth before you store them.Figure 2-34 illustrates the drawing nib angle to paper.Figure 2-34.—Drawing lines with apen.Continued on next page2-29
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