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A new type of cathode-ray tube typically only a few inches thick is described. The beam is injected parallel to one edge of the thin tube and caused to pass through two right-angle deflections: the first sends the beam into the region between the front and back tube surfaces, and the second turns it into the phosphor-coated front surface. A brief analysis of the deflection-focusing action is presented and the sweep-voltage requirements are described. The thin tube can be adapted to multicolor operation or to any other use to which cathode-ray tubes are put; it also has many unique features (in addition to small size), such as the capability of being viewed from both sides of the display screen or being rendered transparent.