Page:Popular Mechanics 1928 11.pdf/51

 image are presented to the eye watching the receiving screen. They are seen as one white image. The new device consists of a transmitter disk perforated with three sets of holes set around the edge of the disk in spirals. One spiral is covered with a red filter, one with a blue and the third with a green filter. Light is projected through these holes so that, as the disk rotates, the object televised is traversed first by a red spot of light, then by a blue, then by a green. At the receiving station, a similar disk revolves at the same speed and its holes are also covered with red, green and blue filters. Behind the disk. and in a line with the observer's eye, are two lamps, one of them a neon-filled glow lamp, and the other filled with mercury vapor and helium. These lamps are the source of the colored rays, and are operated by current from the transmitter. A commutator arranges that the neon lamp, the red-ray source, is alight during the time in which the radio eye views the image of the object through perforations covered by the red filters. When the blue and green images of the object are being transmitted, and the radio eye is viewing the image through the blue and green filters, the mercury and helium lamp, emitting blue and green rays, is in operation.

Another advance in the Baird television processes, is the reproduction of living images in stereoscopic relief. Here a similarly perforated disk is used. Pencils of rays from a spotlight lamp scan the object to be transmitted through lenses, so that it is explored from two points, one to the right and the other to the left. On the receiving disk, the two images are viewed through two prisms, making the observer see an apparently solid object.

 



A battle for ownership of the speed honors of the North Atlantic, held for many years by the now aging "Mauretania." is in prospect with both England and Germany building larger and faster ships. The German yards have launched two 46,000-ton liners, to be named the "Bremen" and "Europa," and both the White Star and Cunard lines are preparing to build 60,000-ton ships which will equal the ill-fated "Titanic" in size, being longer than either the American-owned."Leviathan" or the British "Majestic." both of which, incidentally, were built by German yards just before the war to make a bid for the Atlantic de-luxe passenger business, but fell into the hands of the allies. The two new liners recently launched are expected to cross the Atlantic in four days.

