Technical Drawing Line Types - cobanengineering G; Continuous Thin Zigzag Line: It is used when free hand lines are drawn by tools. H; Free Hand Line: Limits of partial and interrupted views and sections. I; and J; Parts situated in front of the cutting planes, outlines of adjacent parts, Censorial Lines, to state center of gravity. ANSI Technical Drawing Views. A: Projected Two View Drawing; Basic Types of Lines Used in Engineering Drawings - Wisc Basic Types of Lines Used in Engineering Drawings. In this highly interactive object, learners associate basic line types and terms with engineering drawing geometry. A quiz completes the activity. The learner will describe the non-inverting op-amp configuration and calculate the circuit gain.