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 13: Concrete blocks of end walls and precast concrete beams at both ends of still set in place. Spacing sticks used to ensure setting of beams at center-to-center distance so that glass panes will fit properly.