Sylvania Electric Products Inc. was an American manufacturer of diverse electrical equipment, including at various times radio transceivers, vacuum tubes, semiconductors, and mainframe computers such as MOBIDIC. They were one of the companies involved in the development of the COBOL programming language.
Sylvania Model 4P14 (1961) radio, made of plastic
Sylvania was a major manufacturer of vacuum tubes until the early 1980s
Vacuum tube cartons displaying two generations of Sylvania branding
SG7460 (7400 series) integrated circuit manufactured by Sylvania
A flash is a device used in photography that produces a brief burst of light at a color temperature of about 5,500 K to help illuminate a scene. A major purpose of a flash is to illuminate a dark scene. Other uses are capturing quickly moving objects or changing the quality of light. Flash refers either to the flash of light itself or to the electronic flash unit discharging the light. Most current flash units are electronic, having evolved from single-use flashbulbs and flammable powders. Modern cameras often activate flash units automatically.
The high-speed wing action of a hummingbird hawk-moth is frozen by flash. The flash has given the foreground more illumination than the background. See Inverse-square law.
Demonstration of a magnesium flash powder lamp from 1909
Vintage AHA smokeless flash powder lamp kit, Germany
Ernst Leitz Wetzlar flash from 1950s