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Types of Visual Aids and Their Uses 49
The units which are now available include the following: Pioneer Days Indian Life
Life in Colonial America Knighthood — Life in Medieval Times Early Civilization Transportation Clothing and Textiles Christmas in Many Lands Our City — Home and Community Life
The Opaque Projector
The opaque projector is an instrument which projects on a screen by reflection any pictures, diagrams, and other flat or near-flat surfaces, which can be placed in the aperture of the instrument. It has many advantages, and certain limitations, which should be given consideration by those who desire to use photographs, prints, diagrams, and the like for classroom instruction in the most effective manner. The average opaque projector for classroom use ranges in price from $100.00 to $140.00, depending upon the type selected and the completeness of the instrument. It is light in weight and may be moved from room to room with ease.
Advantages: The greatest advantage of the opaque projector is that it will project almost anything onto a screen for group study or consideration. Furthermore, the pictures thus projected are reproduced accurately as to color. A color plate from The National Geographic Magazine, for example, may be placed in a good opaque projector and enlarged upon a suitable screen to almost any desirable size, without damage to the picture.
This leads, logically, to the extreme economy of the opaque projector. Materials for use in it may be collected from hundreds of sources, including books, magazines, post cards, travel bulletins, catalogs, or nearly anything which has in it an illustration worthy of class consideration. Ordinary typed material, drawings, diagrams, and graphic presentations of all kinds may be used in it quite satisfactorily. Although pictures in books and magazines may be projected without removing them from the books or magazines, it is usually more convenient to mount the pictures on cards. They can be handled more easily and will be available for individual study when desired.
A great advantage of the combination projector for opaque projection and for use of glass slides is that the change from one to the