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illumination at as many diflPerent places as desired. From the values obtained, an illumination engineer is able to duplicate this condition in any theater. Obviously, spe- cific instructions for theater lighting can not be laid down because every- theater is more or less a problem in itself. Such factors as the size, the architectural details, use of cornices and arches, the reflecting power of various ceiling and wall surfaces have to be taken into any computation. Certain decorative schemes, especially of ceiling, may also have to be worked out in order to make the lighting most effective. Since the lamps must in general be placed close to the ceiling, certain regions require a low reflecting power and others a high reflecting power. All of these factors may be taken into account, however, and with close co- operation between the lighting engineer and the designer of the decorative scheme, a highly satisfacton.- arrange- ment may be chosen. To show the improvement which might be brought about in a theater in which the lighting system was already installed, the Kodak experts designed a scheme of illumina- tion for a small theater used for the exhibition of motion pictures. The results obtained in the experimental room were made the basis of the new calculations. The details were worked out to give ver\- nearly the same amount of general illumination as the experimental room. In this case also, the results were found to be satisfactor\- and the general effect more pleasing with less strain on the eyes. The general conclusion which can be drawn from these experiments is that a relatively large amount of general illumination may exist in a motion picture theater without interfering with the projected picture provided the illumi- nation is properly distributed. at the test plate and by changing the position of a small incandescent lamp in the instrument, a balance in intensity is secured between the light from the test plate and the light from the lamp. The illumina- tion can then be read directly in foot-candles on the scale of the in- strument.