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Text File  |  1992-09-02  |  378b  |  11 lines
  1. Instrument that measures luminous intensity,
  2. especially relative intensities from
  3. different sources. Bunsen's grease-spot
  4. photometer 1844 compares the intensity of a
  5. light source with a known source by each
  6. illuminating one half of a translucent area.
  7. Modern photometers use photocells, as in a
  8. photographer's exposure meter. A
  9. photomultiplier can also be used as a
  10. photometer.
  11.