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Seattle.

Material:
Two sheets 4' x 8' x 3/4" standard finished plywood.
Cut sheets in half - 4 sheets 4' x 4' x 3/4"

PROCEDURE:
1   Upright first sheet, placing perpendicular to wall.
2.  Align sheets 2# & 3# on vertical, edge - juxtaposed
3.  Place sheet 4# at Rt [[angle symbol]] to sheet three, 4" down from top edge and centered - weight will extend through sheet 1,2,3 holding them upright in line and forcing #1 to wall.

[[image - diagram of four square boxes and annotated 1 2 3 4  Wall Floor [[right arrow]] 4" down top edge centered at rt [[angle symbol]] ]]

R. Serra 1969