When developing a well tor a half-space landing, first draw the plan of the well, as shown at Fig. 1; then through c draw the tangent A B, of course parallel to D E. Then set off lines FA and GB at 60' to D and E respectively, as shown; then the line A B, for all practical purposes, will be equal to the semicircle P C G. From this the development of the well - that is, the shape of the veneer - can be set out as represented at Fig. 2, which shows how the thin board would be marked out before being bent over the cylinder.

Development of Staircase Well.