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• <br /> 40 <br /> room. Shelves shall not exceed four feet in length or 1.2 inches <br /> in width and shall be supported by means of iron brackets. <br /> ARC LEAPS FOR MACHINES. <br /> Arc lamps used for machines must be in accordance with <br /> The National Electric Code. <br /> PROTECTION FOR FILMS. <br /> Top and bottom reels must be enclosed in steel boxes or <br /> magazines, each with an opening of approved construction at bottom <br /> or top, so arranged as not to permit entrance of flame to magazine. <br /> No solder is to be used in the construction of these magazines. <br /> The front side of each magazine must consist of a door spring- <br /> hinged and swinging horizontally and be provided with a substantial <br /> latch. <br /> Films that are not in the magazine of the machine or <br /> in the course of rewinding must be kept in a metal box of ample <br /> size to store all reels. The box must be constructed of metal at <br /> least No. 18 U.S. guage and built into the wall, the door of box <br /> being flush with and forming a part of the wall on the interior of <br /> the booth. The door to be hung from the top and equipped with <br /> spring hinges with a substantial catch to keep it closed. <br /> A shutter must be placed in front of condenser, arranged <br /> so as to be readily closed. <br /> An automatic shutter must be provided and must be so <br /> constructed as to shield the film from the beam of light whenever <br /> the film is not running at operating speed. Shutter must be <br /> permanently attached to the gate frame. <br /> OPERATION, <br /> Sec. 3: Machines may be operated by hand or motor driven <br /> and machines shall be of such type approved by the Underwriters <br /> Laboratories, Inc. <br />