Word: layering
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Inside its flat glass front is a layer of transparent material that conducts electricity. Behind this is a layer of a "photpconductor," i.e., a material that conducts electricity only when light is shining upon...
...photoconductor. A slender beam of electrons from an "electron gun" scans the rear side of the photo-conductor. When the electrons hit a brightly lighted area, a lot of them pass through. When they hit dark parts, only a few of them pass through. The transparent conducting layer collects the escaping electrons and passes them on in the form of a "video" current whose rapid fluctuations represent the light and shade of the picture. An ordinary television set turns the current into a copy of the scene which the Vidicon is viewing...
Since then the University had covered the walls with wallpaper, hiding the painting from view. As the years went by, layer after layer of paper went on in each successive redecoration of the room, until this year the college decided to give it a complete renovation, starting from scratch...
Tons of Neutrons. This week, on a similar broadcast, Brown repeated his shocker. Physicist Leo Szilard of Chicago added that 50 tons of neutrons released by hydrogen fusion could ring the earth with a radioactive dust layer capable of killing the earth's entire population. Physicists Frederick Seitz of the University of Illinois and Hans Bethe of Cornell, appearing on the same program, were more moderate, but they went along generally with their emphatic colleagues...
...Bell crystals are grown in thick-walled steel "bombs" filled with a water solution of alkaline material (see diagram). At the bottom is a layer of finely ground quartz (silica). A small quartz crystal (it may be only a sliver) is suspended near the top. When the bottom of the bomb is heated to 750°F., and the pressure raised to 15,000 Ibs. per sq. in., the ground quartz dissolves. Its molecules diffuse through the solution. When they reach the cooler top of the chamber, they deposit one by one on the "seed," building it into a perfect...