1)  Lay vellum or scrap drafting film over the area of the plan to be projected;

2)  lay out the horizontal datum line and the horizontal lines of the image;

3)  beginning with corners and edges closest to the picture plane, project the verticals;

4)  erase all hidden lines.

14.2.0  CIRCULAR STAIR PROJECTIONS 

1)  Overlay stair plan with vellum;

2)  lay out lines representing height of each tread;

3)  draw support column;

4)  project the stair edges and corners, rotating the plan drawing in the direction of its rise;

5)  erase all lines hidden behind the support column;

6)  check the number of steps, as well as final positions at landings.  Check handrails for smoothness, accuracy and three-dimensional realism.