This lesson explains how to construct auxiliary views by projecting true lengths, widths, and heights from reference or fold lines. It emphasizes measuring perpendicular to reference lines, projecting information in the correct direction, maintaining parallel edges, and distinguishing dark object lines from light construction lines. The lesson then introduces sectional views, demonstrating how to apply evenly spaced hatch lines, leave holes and open spaces unhatched, exclude thin components and hardware, and use different hatch directions to distinguish separate components.
