Selected Bibliography Architectural Graphics | Seite 14

COMPASSES
The compass is essential for drawing large circles
as well as circles of indeterminate radii.

• It is difficult to apply pressure when using a
compass. Using too hard a grade of lead can
therefore result in too light of aline. Asofter
grade of lead, sharpened to achisel point, will
usually produce the sharpest line without
undue pressure. Achisel point dulls easily,
however, and must be sharpened often.

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• An attachment allows technical pens to be used
with acompass.

• Even larger circles can be drawn by appending an
extension armor using a beam compass.

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• Avariety of French curves are manufactured to
guide the drawing of irregular curves.
• Adjustable curves are shaped by hand and held
in position to draw afair curve through a series
of points.
• Protractors aresemicircular instruments for
measuring and plotting angles.

8 / ARCHITECTURAL GRAPHICS