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CH. XI] MOVING PICTURE EXHIBITION 433
paper would be. The end of the film did not get as hot as that projecting from the upper magazine because the rising flames did not tend to play around the unburned part. It would seem, therefore, that the fire would probably not be carried into the lower magazine along with the film. Of course, with the upper magazine the film is going out of the opening in normal operation. What would be the effect of the sharp blaze from a meter or more (three feet) of loose film which would quickly unwind if the film broke can only be conjectured. It would be likely to get the magazine red hot and set the film inside on fire.
With these possibilities of risk in mind, one will naturally be very careful in handling the apparatus, so that nothing shall start to burn and to follow the precautions of keeping all of the films not in use inside of fire-proof boxes. The two films in use are : the film in the machine, and the film which has just been run through and is being rewound.
When non-inflammable film is used the above precautions are not necessary from the standpoint of fire risk, but the films might be spoiled. It is, however, a good plan to be careful even if noninflammable films are used, so that habits of carelessness will not lead to accident should one of the celluloid films be included without the knowledge of its nature.
THE CONDUCT OF AN EXHIBITION
§ 597. Inspection of the plant. — Is the exhibition going to go smoothly, without hitches, or will the light be poor and go out, the film be out of focus, and break and everything go wrong? This depends largely upon the operator and a very careful inspection of all the apparatus before the exhibition begins.
The principle things to look out for are:
(1) See that all wiring is in good shape, no binding posts loose, no wires almost burned out in the lamp.
(2) See that the carbons in the lamp are long enough, that extra carbons are ready, that tools to change carbons are handy.
(3) Burn the arc a little while till the carbon ends are properly shaped.