Geometric Terminology for Boilermakers. Squaring Lines and Drawing Lines Parallel. Dividing Lines, Circles and Angles. Constructing Angles and Transferring Angles. Tangents and Tangent Points. Calculations Required for Marking-Off. Elementary Print Reading. Marking-Off Cambers. Marking-Off Ellipses. Parallel Line Development. Radial Line Development. Combined Parallel Line and Radial Line Development. Triangulation of Transition Pieces. Hoppers: Regular and Offset.