DRAFTING TECHNIQUES
• When drawing vertical lines perpendicular to the edge
of the T-square or parallel rule, use adrafting triangle
and t urn your body so that you can draw them in a
manner similar to the way you draw horizontal lines.
• Avoid simply drawing the vertical lines by sitting st ill
and sliding the pen or pencil up or down the edge of
the triangle.
• Drawing a series of parallel lines using two triangles
is useful when the series is at some angle other than
the standard 30°,45°, 60°, or 90° angle of drafting
triangles.
• Position the hypotenuse of one triangle against the
hypotenuse of the other and and align one side of the
upper triangle with the given line.
• H the bottom triangle firmly whileyou slide the
old
other triangle to t he desired positions.
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• To draw aperpendicular to a given line, first position
the h
ypotenuse of one triangle against the
hypotenuse of the other.
• Align one side of the upper triangle with the given line.
• Hold the bottom triangle firmly while you slide the
upper triangle until the perpendicular side is inthe
proper position.
ARCHITECTURAL DRAFTING/ 19