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APPENDIX
of the motion picture machine in the school room and removes the last objection to its installation.
A separate stereopticon is a necessity in any school having an organized system of visual instruction.
Non-Inflammable Film
Schools should purchase only non-inflammable film of standard theater width (acetate of cellulose base). This should be stored in humidor cans to preserve its flexibility, or in humidified vaults or containers. With this type of film there is no fire risk whatever involved, and no insurance permits are required.
Motion Picture Cameras
A motion picture camera using standard width film will be found a useful adjunct to motion picture equipment. It should not require a crank, as amateurs find it difficult to turn the crank of a heavy tripod camera with the proper uniform speed necessary to good photography. Heretofore, also, standard motion picture cameras were too expensive for ordinary school use (they cost from $600 to $5,000) . Excellent cameras, however, capable of doing professional work are available now at about $150. As in the case of projectors, narrow width cameras should be avoided, as their pictures cannot be shown by ordinary projection machines. The pictures are also too small to magnify proportionately without grain effect on large screens, and the small size of the lens opening in sub-standard projectors reduces the illumination so that it is insufficient for standard brilliancy, except in the home or smaller classrooms.