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Types of Visual Aids and Their Uses 107
Moving the class to another room, or with another class or section, is likely to become little more than a picture show, except in situations where a skillful auditorium teacher is in charge.
9. Follow the use of the pictures with an adequate test or other checking device, to determine the progress made. This procedure will have a tendency to develop among class members the seriousness of purpose of the picture presentations.
10. Make certain that the film and equipment are forwarded to the next teacher or school according to schedule. Report any difficulties in projection, such as breaking the film, irregularities in projection, etc., to the person in charge of the visual instruction service for the building or school system.
11. Plan for the next picture well in advance, relating it as closely as possible to the topic with which it is to assist.
Types of Film. There are two types of film in general use, one of which is used almost exclusively in the theatrical field, and the other almost exclusively in the field of education. One is nitro-cellulose or inflammable film, and the other is cellulose acetate or "safety" film. The theatrical motion pictures are mainly printed on nitrocellulose film. This film is inflammable and requires extreme care in handling. It is a little more durable than "safety" film and costs a little less. Theaters are equipped with fireproof projection rooms and also fireprevention gadgets of various kinds, so there is no great hazard encountered in using this film in theaters. It is more economical and is used for practically all theatrical productions.
The other type of film is made of acetate of cellulose and is the slowburning or noninflammable film, known as "safety" film. Inasmuch as the majority of the schools which use motion pictures do not find it convenient to project them from a booth or projection room, the "safety" film is much more desirable for use. All 16 mm. motion pictures which are released for educational service are printed on "safety" film. The majority of the 35 mm. silent and sound pictures which are available for schools are on "safety" film also. Schools which use 35 mm. motion pictures in portable projectors should make certain that the films are of the "safety" type, for there is a great hazard in using the inflammable films outside of suitable projection rooms. In some states and in many cities the use of nitrate films, except in accordance with very strict regulations, is a punishable offense.
The use of the 16 mm. "safety" film in all the usual 16 mm. motionpicture projectors does not affect fire regulations of the state or city and does not affect the insurance rating on the building in which the