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studios in the West, the use of a three-unit set was recommended as a solution of this problem. That this recommendation has worked out to good advantage, is without question. The first threeunit set tried out was installed at the Robert Brunton Studios in Los Angeles, California, and this set has now been in operation for more than two years and has given perfect satisfaction. Since then, additions have been made until their capacity is now 460 K.W,, all in three-unit sets, on which they have standardized.
IV. CONCLUSIONS
Therefore, after a careful consideration of the many features that have been brought out, the conclusion is reached that the two types of apparatus best suited for converting alternating-current supply for direct current for studio illumination, are the rotary converter and the three-unit motor-generator sets for three-wire systems. The two-unit two-wire motor-generator sets might be best suited for small installations but it would certainly be third choice on larger installations.
Furthermore, we would especially call your attention to the fact that while the selection of proper equipment for supplying direct-current to the studio is of great importance, it is by no means the only problem which will have to be solved. The selection of proper switchboard for controlling and paralleling the generators and providing for the proper selection and protection of stage feeder circuits must be given careful consideration. Power transformers, where used must be of ample capacity and of the most suitable voltages. Proper protective devices must be installed to insure continuity of service and protection to human life.
Care should be used in placing apparatus in the power-house of the studio so as to keep to a minimum, the amount of floor space required and yet make all parts easily accessible for times of unforeseen emergency.
In laying out a new studio it would be well to make provisions for future extension. Failure to do this has already proven somewhat expensive to some of our large studios.
There are many other factors which should wisely be considered in making a complete electrical layout for the studio but we have discussed with you what we consider to be the most important and which must be settled before other details can be decided upon.
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