FROM FAR LEFT: a piece of three parts, all 96" long. One a cylinder 24" in diameter, and two conical sections whose diameters move from 18" to 24" and the other from 24" to 30". MIDDLE PIECE: Four cylinders of constant length -- 72" -- and varying diameters -- 18", 24", 30" and 36". FAR RIGHT: four cylinders of constant diameter -- 30" -- and varying lengths of 30", 45", 60" and 72". 1970