The valve member 30 may be formed as the head of the piston 2 and may be provided with a differential seating 2G to which liquid is admitted under the air pressure through a port 8a in a plug 8 seated in a cap 1b on the end of the cylinder. As the seating 2G moves down, a ...
since the image moves through areas of local disruption caused by upwelling water moved to the surface by the rising bubbles. FIG. 2 illustrates a perspective, sectional view of a water surface projection system200of an embodiment of the invention. As shown, the system200includes a basin or ...