Drawing aids, ContinuedSpecialirregularcurvesIn general, special irregular curves are curves not common to a NavyDrafting shop. These include ship’s curves, mechanical engineer’s curves,conic sections, and logarithmic spiral curves.SHIP’S CURVES: These curves are peculiar to ship building. They areelongated curvilinear shapes in a variety of sizes.Figure 2-48 shows ship’s curves.Figure 2-48.—Ship’s curves.MECHANICAL ENGINEER’S CURVES: Irregular noncircular curves aredrawn with mechanical engineer’s curves. These curves are very similar tofrench curves.CONIC SECTIONS and LOGARITHMIC SPIRAL CURVES: These curvesare rarely found in a Navy Drafting shop.Flexible curverulesThis unusual rule is used for drawing irregular curves. Completely flexible,most bend to a minimum radius of 2 inches. They have a metal or lead corewhich makes them bendable to any desired shape. Some have clear plasticedges graduated in increments.Continued on next page2-40
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