Voltage stabilizer
A transformer used to produce a steady output voltage despite fluctuations of input voltage.
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In the case of papers or films which receive the first exposure under the enlarger, exposure can be precisely controlled by maintaining the light intensity constant with a voltage stabilizer in the enlarger circuit and by setting the exposure time ...
Instead of condensers, the light is passed through frosted glass, to diffuse it. The diffusion enlarger usually requires a voltage stabilizer, and there are timers which compensate for the longer time to full luminosity of the bulbs.
 See also: Stabilizer, Emulsion, Camera, Blue, Film
  
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