The manual offers step-by-step instruction for making effective blackboard sketches using chalk and charcoal, beginning with basic strokes and progressing to complete classroom illustrations. Plates show stroke techniques and examples — simple shapes, objects, landscapes, seasonal and subject-based drawings — with explicit directions for pressure, angle, and chalk handling. Lessons explain how to adapt sketches for reading, arithmetic, geography, history, nature study, calendars, and holidays, and encourage teachers to practice strokes, vary touches, and adapt examples rather than copy them. Emphasis is placed on using sketching as a visual teaching aid to hold attention, clarify lessons, and lead children to use drawing as spontaneous expression.