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FOR MANAGERS AND OPERATORS 143 is not the same size or shape as the moving picture, so that where both are used it is impossible thus to outline. A neat, heavy moulding around the curtain adds very much to the effect, but better yet is a "flare" from eighteen inches to two feet in depth such as one sees in the proscenium arch of a theater. The curtain should be of size to accommodate a picture in which the figures will be at least life size. Nine by twelve will do nicely for a small house, but for a house of ample dimensions the picture should be at least fifteen feet in width. It must be remembered, however, that every foot added to the picture size adds enormously to the nec- essary light intensity to produce equal brilliancy. A certain amount of light is projected to the curtain and is diffused over a given area, depending on the size of the picture. The 9x12 picture covers 108 square feet, while the 15x18 occu- pies 270 feet of curtain space—considerably more than twice as much. The writer has often been amused to hear oper- ators discussing the matter of current and asserting that they never use more than twenty-five amperes, or thirty-five amperes, or whatever the individual's preference happened to be. Let me say right now that such talk is foolish. The light intensity, within certain limits, is governed (not alto- gether, but largely) by the amperage and the light intensity necessary to produce a given result will depend almost altogether on the size of the picture projected. In planning your house this matter should be given due consideration. Better have a good small picture than a large one bad. The writer is using forty-five amperes of direct current at the present time, but he throws a fifteen-foot picture in a house where there is lots of light, part of it being daylight which strikes the curtain badly in the forenoon. Under different conditions he could get better results with one-third less current. EFFECT OF DAYLIGHT AND HOUSE LIGHTS ON THE PICTURE. Every particle of light, especially daylight, which strikes the curtain directly dims the brilliancy of the picture, but if the light rays be shaded from the curtain so that they do not strike it directly it is astonishing how light the room may be without causing material damage. This matter of