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 AmericaFull Article | PDF Article
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