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1T.HRUARY
Pictures and Pict\ire$<oer
i
Huge revolving drums are used to dry the films.
feet every twelve minutes. The most elaborate precautions are taken to ensure that not the least speck of the dust created by this work shall escape into the atmosphere. Powerful uum pumps attached • to each machine carry away the results of the perforation to a specially-prepared tacle outside the building.
The negative, cut up into lengths of feet, according to the colour required, is now passed by the negative cutter to the braider, who judges the scenes throughout, and states the necessary intensity of light each scene will require during the printing-. Each change of light that is wanted is indicated by a small notch cut in the edge of the negative. An ingenious mechanism ensures that these changes shall be automatically made by the printing machines while the film is running through.
The printing is done by placing a Cutting sections of films ready
.The perforating-room, where the raw stock is handled
reel of negative film and a reel ot unexposed positive film, with a lens between, in the printing machine, and rotating them in rapid unison. The
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From the printer the positive (ill taken in d wound
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teeth on top and bottom of lli .11. necessary to prevent the strips film coming into contact with another during the process.
The air in these rooms is taken in hand again and made moist. I)r\ would tend to produce discharge: static electricity and cause " frietional fog" on the film; so it is kept humid by means of minutely fine vapourisation at a constant temperature of 7? degr
From the printing room then, the film passes to the developing room through ingenious cupboards, so constructed that only one door can he opened at a time. Should the door in the printing room he inadvertently left open, the door into the developing room cannot he opened until the other door is shut. In this way any chance of light accidentally falling on the undeveloped film is avoided.
In the developing room, four frames at a time (800 feet of film), are immersed in the developing tanks for approximately five minutes. Developed, the prints are now passed through the water tank and the hypo hath, and so through another, and similar, system of (Continued on page 65).
for joining.
The joining-room, inhere the sections are made into 1,000 feet reels