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THREE-DIMENSIONAL MOTION PICTURES retreading of the second half of the program. This time will also be necessary to give the projectionist time to recarbon his arcs. The use of the 5,000 feet reels, means that the arc lamps must burn continuously for approxi mately one hour. To the running time of the film must be added the two minutes time necessary for the 44 buraing-in" of the new carbon trim,, and the 10 percent safety factor, when figuring the retrim. A 20-inch trim of carbons will burn continually for a full hour at 78 amperes, when using 9 mm. positive and a 5/16th" negative. Or the same 20-inch trim will burn a full hour at 95 amperes when using 10 mm positive and ll/32nd negative. A constant check of the arcs will be necessary all during the running of the film program to keep the light values at each arc uniform and to watch the color values of each of the arcs. A 9-mm positive can be burned at 82 amperes and a 10--mm positive at 98 amperes for 50 minutes, but to this time must be added the burning-in time of two min utes and a 10% safety factor, so it would be necessary to use a resistor pad to slow down the feeding of the arc. With a resistor pad a 9-mm positive carbon can be burned at 78 amperes and a 10-mm at 95 amperes to get one hour burning time. A pad would be necessary for each arc. While this would serve the purpose of secur ing the necessary length of time for the projection of the oversized reels, the use of the pad will further cut down the amperage at the arc and the light at the screen. Projectionists should equip themselves with three pairs of glasses for use in viewing and focusing Natural Vision pictures. One pair will be identical with those worn by the audience, and used to watch the screen dur ing projection of the picture. The other two pair are used to focus each of the two pictures on the screen.