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Types of Visual Aids and Their Uses 93
"They can be used within the school system to show how the best teachers are solving their problems and in this way help the poorer teacher to do better work.
"At first, we would suggest that only outdoor pictures be made, then later, the school photographer will naturally want to try some indoor pictures.
"The inside pictures with the outside pictures will provide a complete record. Many senior high-school teachers and college teachers seem to feel that the lecture method of teaching is the method best suited for their work. A dry lecture can be made into an interesting lesson oftentimes by the simple expediency of using a filmslide to illustrate what is being said."
These little 35 mm. cameras and film, producing negative exposures about I1/:/' x 1", are used for everything than can be done with almost any other type of photographic equipment. The pictures are recorded along the film, rather than . across it as on the single-frame filmslide, The high quality of many of the negatives produced permits making enlargements to any desired size. By using an auxiliary lens, copies of photographs, drawings, manuscripts, or other flat materials may be made. The uses of the miniature cameras are almost unlimited, especially for those who desire to collect materials to be projected in classes or before other groups. As previously indicated, the positive film prints from this negative are filmslides, and may be printed in sequence on filmstrips, or mounted between glass as individual slides.
If it should be desirable to have enlargements of some of the pictures which appear on the small film, such enlargements are comparatively easy to make, as low-priced equipment is available for the purpose. Some amateurs have attained great skill in making enlargements by projection of the negative image through inexpensive enlarging equipment. Or, one can have moderate-sized enlargements made by reliable photo-finishing laboratories at a cost of from six to twenty-five cents each. With the newer fine grain films, it is possible to secure results which permit enlargement of ten to fifteen times the dimensions of the negative.
The load, or roll of negative, used in the double-frame 35 mm. cameras is long enough for thirty-six exposures, and is commonly priced from seventy to eighty-five cents. Those who may be economical in their inclinations should purchase raw film in 400-foot rolls and load their cameras at a cost of about fifteen cents per roll of thirty-six exposures. The usual charge for developing the negative and print