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THREE-DIMENSIONAL MOTION PICTURES lij.7 audience, because of the wearing of the polaroid glasses. The loss of this light, may mean that the arc amperage will have to be increased, and in those theaters that are now using maximum amperage output, this problem may require the installation of entirely new designed arclamps, the present maximum amperage output cannot very well be increased with the present type arcs, due to the excessive heat on the film at the gate aperture. This too will call for higher power generators, new rectifiers, and perhaps a rewiring job to take care of the larger load. Every precaution should be taken by the projec tionist to see that there is no undue loss of light anywhere in the projector optical train. Only 2 and one-half size lenses should be used, and these should be of the coated type. It is all important that the two objective lenses are correctly optically matched as to magnification factors and color values. A mismatch in the lenses, a difference in color values or light values between the two projected pictures, will mean eye strain for the audience, and a probable loss of theater patronage. The use of a highly reflective screen, such as the metallic surfaced screen, is required for third dimension pictures, and where this type of screen is installed in place of a matte type screen, a decided brighter picture will be the result, and this will especially hold true in theaters with narrow auditoriums. In theaters where a matte surface screen (a light diffusing type] has re cently been installed, it may be possible to have the screen treated with a metal coating to save the expense of installing a new screen. We have already explained that an intermission midway through the program will be necessary for the