Technical Drawings and Sketches, ContinuedScaleTechnical sketches are not made to any scale. The size of your sketchdepends upon the complexity of the object and the size of your paper.Theyare preludes to fabrication drawings (requiring precise measurements) andonly meant to convey an overall idea. Using gridded or ruled sketchingpaper helps you to draw objects to size.Figure 4-2 shows various types of ruled papers.Figure 4-2.—Ruled sketch paper.ProportionTechnical sketches must be proportional. No matter how much attention youpay to detail or how good your technique is, if the proportions are incorrect,the image is not successful. One method of establishing proportion is to usea small dowel or your pencil as a measuring stick representing an arbitraryunit of measure. Begin establishing proportion by comparing height-to-widthratios. Visually transpose that measurement to your paper. As you proceedwith the sketch, continue to compare larger areas with smaller areas using thedowel or pencil as a ruler.Figure 4-3 illustrates how to use a dowel or pencil as a unit of measure.Figure 4-3.—Using apencil as a unit of measure.Continued on next page4-5
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