Abstract: An eye refractometer including a measuring target projecting optical system for projecting a measuring target to a patient's eye using an infrared ray. A viewing target is provided in the projecting system and located more distant from the patient's eye than the measuring target. A filter is located between the two targets and has a portion which is transparent to visible light and corresponds to the viewing target. The remainder of the filter is opaque to the visible light but transparent to infrared ray. The two targets and the filter are assembled together so that they are moved as a unit.

Abstract: A monolithic solar battery including a plurality of P-N junction unit solar cells mounted on a substrate is provided. Each unit solar cell is isolated electrically from an adjacent cell by a buffer region of a material having a different conductivity than the substrate. An active photovoltaic layer formed on the light receiving surface of each solar cell between two buffer regions overlaps one of the two buffers defining each cell. Wiring for electrically connecting the unit solar cells in series fashion and electrodes are provided on the upper or lower surfaces of the substrate.

Abstract: An apparatus for continuous froth flotation is disclosed which comprises a vertically elongate column having disposed therein a froth separator, a raw water inlet pipe, a treated water discharge pipe and a gas dispersing unit, and stepped shelves disposed inside said column and adapted to provide thorough contact between the bubbles and the water subjected to treatment.