Abstract: Plastic bottles from a molding machine are transported on a conveyor through a leak testing device where a predetermined number are temporarily stopped in register with overhead reciprocable test heads and with lateral ejectors on one side of the conveyor path. The bottles are supported on the opposite side by a movable side gate which, when a defective bottle is to be ejected, is moved to a clearance position. The test heads are lowered into air tight communication with the mouths of the bottles and a constant volume of pressurized air is discharged into each bottle from a reservoir. The resultant pressure of the bottle-reservoir system is an index of bottle integrity.

Abstract: A solar water heating device and construction for heating the water in a swimming pool from the heat derived from the rays of the Sun. The pool is constructed with a border platform or coping around its edges with a hollow passageway under the metal top surface of the coping. The passageway has water pipes extending therethrough and connected to the pool circulating pumps for circulating pool water through the water pipes. Heating fins are carried by the water pipes and extend into heat exchange contact with the metal top coping, which is being heated by rays from the Sun. Thus the Sun's rays are conducted in the form of heat into the piping water for circulation into the pool and heating its water economically.