Keywords: Zibold condenser (section).jpg en Zibold's dew condenser a is a truncated cone of beach pebbles 20 m in diameter at the base and 8m in diameter at the top b is a concrete bowl; a pipe not shown leads away from the base of the bowl to a collecting point c is ground level and d is the natural limestone base own Gaius Cornelius 2009-03-25 Air wells Truncated cones |