(under subclass 213) Subject matter including a hollow body of spherical interior and having an interior surface of highly reflecting and also diffusing material and having relatively small openings in the shell of the body to admit light for the purpose of raising the interior illumination to a level which depends only upon the amount of light entering the openings and not upon the reflection or diffusion of the incident light flux.
SEE OR SEARCH THIS CLASS, SUBCLASS:
215, for photometers which integrate the light intensity in general and usually with respect to time.
432+, for transmission testing devices which may include integrating spheres.
445+, for reflection testing which may include integrating spheres.
SEE OR SEARCH CLASS 250, Radiant Energy,
228, for integrating spheres with photocells.
324, Electricity: Measuring and Testing,
403+, for electric lamp testing including the electric operating characteristics and which may include an integrating sphere.
