2”w × 7’h × 2’d (approx.)
Fourth in the “Exhaler” series. A 5 inch diameter clear acrylic tube filled with water. Inside the tube is a brass cylindrical shape (Actually a World War II era brass artillery shell). As air fills up the cylinder, the cylinder slowly rises to the surface where a float valve tips letting the air out. The cylinder slowly sinks back to the bottom until it fills with air again.