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THREE-DIMENSIONAL MOTION PICTURES form of interlock will be required, to keep the two projectors running in synchronism, during the projec tion of the picture. Two forms of interlock are available or soon will be, these are the mechanical interlock, and the electrical interlock. The merits of these respective types of interlocks is fully covered elsewhere In this book, the electrical interlock calls for the purchase of two new Selsyn motors to be used in addition to the two driving motors already on the projectors, together with other units making up the interlock system. The interlock will undoubtedly be sold complete as a unit. The cost will be about $500.00. The mechanical interlock, which will also be placed on the market as a complete unit, will cost between $250.00 and $450.00, plus Installation. Other new equipment required will be polaroid filters and filter holders for each projector, polaroid viewing glasses for the projectionist etc. A check will have to be made on the present electrical equipment such as generators, rectifiers, and arc-lamps, and the. electrical wiring system. Present day equipment was not intended for continuous operation, unless your present generator or rectifier is oversize, it may be necessary to replace these with higher output appliances. In regards to your generator, here is a thumb rule to use "The combined amperage drawn by both arclamps running on a con tinuous basis must not exceed 75% of the higher amperage rating of the generator." As an example, (1) If you desire to draw 70 amperes for each lamp, which means a 140 ampere continuous load, then the generator rated 100/200 amperes should be used, since 75% of 200 amperes is 150 amperes. (2) Should you desire to draw 80 amperes on each lamp for a total of 160