Cased InstrumentsIntroductionCased instruments allow the draftsman to make precision drawings andmaintain uniformity within the drawing. Quality tools improve the work.Use these tools for their intended purpose.CasesDrafting instruments are delicate, precision drawing tools that requireprotection. Most instruments, even when purchased separately, come in theirown case. This case protects the drawing tool. Many cases are impregnatedwith a rust or corrosive inhibitor to protect the drawing tools from theenvironment and atmosphere. Keep drafting instruments clean and put awaywhen not in use.Figure 2-18 shows a case full of clean, properly stored drafting instruments.Figure 2-18. —Drawing instruments in a protective case.Continued on next page2-19
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