We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
CHAPTER IX PROJECTION BOOTHS THE government authorities of the different states have passed laws affecting the presentation of motion designed to protect the audiences against danger inc to the inflammable material of the films. There is a sort of coincidence about it that so inflammable a material had to be used at a high temperature, and that literally an interruption in the motion of the film, unless some measure of protection adopted, would almost certainly catch fire. The measure of precaution is the dropping of a metal shutter back of the film, between it and the lamp. This is done auto- matically if the machine stops running. It is a hinged plate of steel or metal, which if left to itself will fall down over the back of the film, and cut it off from the rays of the electric arc or incandescent lamp. The first named, the arc lamp, is gener- ally taken to be the hotter and most dangerous in this n If the safety shutter is held up and the light allowed to bt densed upon the motionless film by the condensers, as it is con- densed in running the machine for projection, the film will surely catch fire in a few seconds. THE BURNING OF FILM The burning is not spectacular. It is rather a gradual com- bustion, with little flame. The film is held in the frame of the gate at this place. It is surrounded and has its edges clasped or enclosed by metal. All this exercises a cooling effect. There is a plate surrounding the gate, the special functions of which are indicated by its name; this is the cooling plate. All this operates to moderate the intensity of the combustion in the exposed part of the film. But the arrangement generally does more than this, it tends to and generally does limit the part of the film, which burns to the portion untouched by the metal. An oblong hole the size of the picture is generally burned out of tbe film. This applies when the film is motionless. It is easy to see that if the film caught fire while the machine was in the rapid motion inci- 168