thumb|right|Schlieren photograph of an attached shock on a sharp-nosed supersonic body thumb|right|USS Iowa firing at broadside during training exercises in Puerto Rico, 1984. Circular marks are visible where the expanding spherical atmospheric shockwaves from the gun firing meet the water surface.
thumb|right|Schlieren photograph of an attached shock on a sharp-nosed supersonic body thumb|right|USS Iowa firing at broadside during training exercises in Puerto Rico, 1984. Circular marks are visible where the expanding spherical atmospheric shockwaves from the gun firing meet the water surface.