Chapter 4 Researching Designs 61
Researching Ideas
Engineers use different types of research to
develop an understanding of the problem and the
potential solutions. Engineers look at how solu-
tions have been solved in the past, review the
mathematical and scientifi c principles used in a
potential design, and survey potential users of the
design. To gain an understanding of each of these
areas, the engineer performs historical research
and experimental research. This research will be
conducted for many potential research solutions.
Historical Research
The fi rst place engineers look to gain infor-
mation is solutions that have solved similar
problems. Engineers often develop innovative
designs, but they do not invent new technologies.
They fi rst look at how they can adapt current
technologies and tools to solve the problem. This
type of research is conducted using different
methods, including library research, fi eld visits,
and discussions with other engineers and profes-
sionals using the technology.
This sketch of a guitar includes the details of the external
features.
Figure 4-9. 
Goodheart-Willcox Publisher
Drawing Compass
Engineers use many different tools to create drawings. While computers are often
used for completed designs, engineers still use manual drawing tools for sketches of
potential solutions.
One example of a manual drawing tool is a drawing compass. A drawing com-
pass is used to create circles of a certain diameter. See Figure A. If you need to draw
a circle and a compass is not available, you can use a piece of string, thumbtack, and
pencil to create your own compass. Attach the thumbtack on one end of the string and
attach the pencil at the desired distance (radius) from the thumbtack.
To use the compass, place the pointed end of the compass (or the thumbtack)
where you would like the center of the circle. Move the pencil end of the compass half
the width of the circle you desire (radius) away from the center, and rotate the com-
pass around the center point.
Tools
Figure A.
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