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completion will, it is hoped, produce dies for a surface having 1000 ellipsoidal elements per sq. in. with a normal brilliance 20 times that of white plaster, the light being toned down at the sides of the viewing angle. On account of the fineness of grain, this surface should appear smooth at a distance of six ft. and sharply delineate the projected picture.13 Trans-Lux Screen
A new system employing the rear projection and the use of the Trans-Lux screen has been brought into existence and had several exhibitions in New York. It is not conclusively proven that this system of projection is destined to become a large factor in the development of motion pictures, it being still too early to demonstrate whether a completely lighted auditorium is a sufficiently important advantage to off-set the complete change required when pictures are projected in this manner. The disadvantage of this system is a short focus lens or the necessity of lengthening the throw by the use of mirrors, as suggested by Mr. A. F. Victor. A demonstration of this method was made in the Eltinge Theatre in New York City several months ago.
Synchronous Converter
A new synchronous converter for use with 900-watt Mazda lamps has just been developed. The apparatus converts D. C. into A. C. With the converter is used a conventional A. C. regulator with manual-control. The overall efficiency of the converter and regulator is about 72 per cent. The initial cost is somewhat higher than for a rheostat but the saving in power bills is sufficiently great to off-set the expense in the first six months of operation. The converter is wound to deliver two-phase, 25-cycle to an alternating current regulator and is capable of operating two 900-watt lamps connected in multiple, one on each phase. It is compound wound and has an efficiency of about 76 per cent. The saving in energy with this device is from two to five kw. depending upon the circuit used.14
Switchboards
Progress has been made of late in the construction of dead front switchboards for use in studios. The switchboards are composed of the standard dead front switches which cannot be opened except when the switch is in the off position, thus eliminating the possibility of persons accidentally coming in contact with live parts.
13 Contributed by Mr. Paul L. Clark.
14 Contributed by Mr. C. A. B. Halvorson.
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