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 23: Layer of asphaltic cement placed on lip of upper beam. Glass then installed, being pressed down into asphalt. Wooden slats holding troughs in place not removed until nearby glass panes installed. Glass panes placed about 1/8 inch apart.