30.105 J.W. Bloemer – J.A. Eibling – J.R. Irwin, Design of a basin-type solar still, (Battelle Memorial Institute, Columbus, Ohio, 19 may 1964). Step 14: Chalk line stretched between two and beams of each row as a guide when placing the rest of the concrete beams. Spacing sticks used on all beams to ensure proper spacing.