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But our very efficient guardians of life and property — the Insurance authorities — promptly pointed out that the principal hazard attendant upon such exhibitions lay, not in any hazard or use in the projector itself, but in the use and storage of the celluloid film used as a medium therein. The very advantages claimed in the use of the portable projector, namely, use without a booth and by people of limited mechanical skill, tremendously increased the film hazard beyond that attending its use in the standard machines enclosed in fireproof booths and under the operation of skillful attendants.
The obvious solution of the problem of hazard lay in the adoption of approved, slow-burning film, but the Underwriters' Laboratories again pointed out that unless the portable projector should be so constructed that it would be impossible to use ordinary celluloid film therein, it was a foregone conclusion that in the absence of any considerable quantity of available slow-burning film, the owners of such projectors would be sure to attempt the use of celluloid films therein (if such use should be possible) and the potential hazard would still remain exactly as before.
To cover the situation properly, the Underwriters' Laboratories suggested, and the National Association of Fire Prevention adopted the specific qualification:
"Approved miniature projectors must be so constructed that they cannot be used with films employed on the full sized commercial moving picture machine." (National Electric Code — Rule 38, Section V, Paragraph 6).
Various attempts have been made to comply with this requirement, such attempts being principally confined to the use of some form of odd perforation for standard width, slow-burning film, to fit a sprocket so constructed that it would mutilate ordinary celluloid film of standard perforation.
None of these attempts have met with any practical success and all of them are open to the serious, if not insurmountable objection that in the hands of any ordinarily intelligent but unscrupulous owner the mutilating sprocket could be very easily exchanged or altered so that it will run standard celluloid film.
Only Satisfactory Solution Is Adoption of a New Standard With Different Width and Perforation
Anything less than this is obviously not deserving and therefore cannot hope for permanent success.
It is only through the fact that the buyers are ignorant of the Underwriters' code and the criminal risk involved that they now purchase and use small portable projectors employing inflammable film. This intolerable condition has greatly retarded the natural expansion of the portable projector industry and the sooner we unite in removing it, the quicker will we enjoy the benefits of a healthy growth and expansion.
One manufacturer as long as seven or eight years ago took the lead boldly by adopting both an odd size and an odd perforation for use exclusively with slow-burning film, with the idea of insuring a thoroughly safe and approved apparatus.
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