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Types of Visual Aids and Their Uses 117
give careful consideration to each of the various makes available. It is true that each manufacturer is proud of his product and sees in it all the advantages possible to incorporate in one instrument, but there are reasons for the differences in mechanical construction and price and those reasons can be discovered, in most instances, by comparison. Some consideration should be given to the type of room in which the projector is to be used most frequently. In the majority of cases it is advisable to use educational films in the classrooms. If this is not possible, the next best plan is to equip one room for projection and reserve it for that purpose, taking classes to it when required. In such cases — in the special room or in a classroom which can be well darkened — almost any of the standard makes of projectors will be entirely satisfactory. If the equipment is to be used in a very large room or auditorium, or in a classroom which cannot be satisfactorily darkened, it will be necessary to select one of the more powerful, 750watt projectors with high quality optical equipment.
All distributors and sales organizations are ready and willing to arrange for demonstrations, if they are assured of the sincerity of purpose of those requesting such service. The firms or individuals who arrange for demonstrations of equipment are performing a real service for those interested in the demonstration; it is expensive to travel from place to place and expensive to purchase and maintain equipment for demonstration purposes. In fairness to local firms or traveling representatives, therefore, it is urged that requests for demonstrations be withheld until there is an active interest in the purchase of equipment. It is decidedly unfair to ask any individual or organization to ship or bring expensive equipment and materials to any school or other organization merely to add variety to an otherwise dull P.T.A. or other community program. Schools which request such service should be willing to pay at least the expenses of the demonstration if equipment is not purchased soon after.
Some representatives travel throughout the country looking for business and will offer to demonstrate while in the school's vicinity. In such cases, those interested in demonstrations should permit them to do so and should consider themselves under no obligation to purchase or to pay travel expenses. Frequently, such demonstrations will arouse an active interest in the use of the equipment and materials.
Those who desire descriptive material concerning projection equipment of various kinds should contact an agency which represents a manufacturer, or write directly to the manufacturer. (See list on page 220.) The manufacturers will provide the information promptly and