Abstract: A solar collector for heating water consisting of an insulated housing having a darkened interior and a light transmitting top which preferably filters out solar rays in the UV range. The housing has ventilation apertures in opposing walls. A soft, flexible, non-opaque plastic bladder is contained within the housing. At least the upper portion of the bladder is translucent so as to partially scatter solar rays. The bladder contains water inlet and outlet means and preferably has a valve in the upper portion which allows the venting of trapped air within the bladder and prevents outside air from entering the bladder and water from overflowing the bladder. When the bladder is filled, it blocks the ventilation aperture. Solar radiation is transmitted through the housing top and scattered or diffused by the translucent bladder. Some solar rays are absorbed by the water in the bladder and converted to heat.

Abstract: A recording process is disclosed in which an X-ray sensitive photoconductive element exhibiting persistent conductivity and a charge sensitive, dry processable recording material are sandwiched between a pair of electrodes. A source of potential is applied across the electrodes and the photoconductive element is briefly exposed to an imagewise pattern of X-ray radiation forming a latent image in the recording material. Allowing the current to continue to flow through the sandwich after the X-ray exposure is terminated increases the sensitivity of the recording process by a factor of up to 100. The latent image is then amplified and rendered visible by uniformly heating the entire recording material.