Photographic Film Are Approximately: The greater quantum efficiencies of both red and green gallium phosphide electroluminescent diodes attained during the past year were mainly due to improved methods of crystal growth and better p-n junction preparation. The technique of liquid epitaxy was of prime importance in this development. Although red diodes are presently 50 to 100 times more efficient than green ones, they have approximately the same brightness, because the human eye and certain photographic film are approximately 20 times more sensitive to green light than to red.
Other long-established infacttires are furniture, clothing, and jewelry. 1945 numerous light industries have devel-notably foodstuffs, paper products, and ils. Among the larger factories are those rayon, soap, pasta, and light engineering itries. There are over a dozen film produc-|studios in Rome, and the film industry is now IJJor source of revenue for the city. The 1 of the film industry is Cinecitta (cinema j a few miles outside of Rome; it contains : of the finest studios in the world. There also numerous workshops for photographic ises.
Speedlights flash, the picture is taken, the film automatically advances, the shutter is cocked, and all is in readiness for the next child in the line. Similar cameras are available which operate with 35mm film. The smaller film cuts costs a bit but naturally the contact prints are not so appealing as those from the larger film.
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Photography
