TRI ANGLES
Triangles are drafting aids used to guide the drawing of
vertical lines and lines at specified angles. They have a
right angle and either two 45° angles or one 30° and
one 60° angle.
411 to 2411 lengths are available.
• 8" t o1011 1
engths are recommended.
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• Small triangles are useful for crosshatching small
areas an as a guide in handlettering. See page180.
d
• Larger triangles areuseful inconstructing
perspectives.
0
90°
• The 45°-45° and 30°- 60° triangles can be used in
combination to produce angular increments of 1
5°.
See page 19.
• Triangles are madeof cle scratch-resistant, nonar,
yellow acrylicto allow a transparent, undistorted
ing
viewthroughto the work below. F
luorescent orange
acrylic triangles are also availablefor greater visibility
on the drafting surface.
• Machined edges should be polished for precision and
to facilitate drawing. Some triangles have raised
edgesfor inking with technical pens.
• Inner edges m be beveled to serve as finger lifts.
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• Keep triangles clean by washing with a mild soap
and w
ater.
• Triangles should not be used as a straightedgefor
cutting materials.
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6 I ARCHITECTURAl GRAPHICS
Adjustable Triangles
Adjustabletriangles have a movable leg that is held in
place wit ha thumbscrew and a scale for measuring
angles.These instruments are useful for drawing such
inclined lines as the slope of a stair or the pitch of a roof.