Abstract

SYNOPSIS

A study of the errors in spherical photometry due to the presence of the lamps and screens in the Ulbricht sphere led to the development of a fixed convex mirror to be used in place of the two larger screens. A further development of the theory of interference within the instrument led to the adoption of a hemisphere in place of the complete sphere. It is shown how the instrument is calibrated and used for the testing of

  • (a) Reflectors for indoor or street illumination
  • (b) Large searchlights
  • (c) Small searchlights, headlights, etc.
  • (d) Motion picture projectors
  • (c) High intensity arcs (for brilliancy).

The various accessories that go with the instrument are described and illustrated

© 1922 Optical Society of America

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References

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Figures (12)

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