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The Audio-Visual Handbook
larger (334" x 4") glass slides are produced. Still others are produced by drawing or tracing on glass, film, or other transparent materials, very much as pupil-made glass slides of larger size are prepared.
The very latest development of the 2" x 2" slide, which offers unusual early future promise, is stereoscopic projection, using one scene photographed from two slightly diiferent angles. The superimposed projection of the two slides is viewed through Polaroid lenses, giving the very real impression of depth or third dimension, either black and white or in natural color. The potential applications of this new development in industry, science, surgery, and classroom teaching are far too great to estimate. There is no organized stereo-slide service available at present, but it is likely such a library of materials will be made available soon.
Photo Courtesy Society for Visual Education, Inc.
Mounted 2" x 2" Slide
What Experience Has Taught Us About Visual Aids*
1. The use of visual instruction may be traced back through the educational history of the race. In primitive times, boys were taught to hunt and fish and girls to cook through imitation, observation, and participation, plus the necessary spoken explanation. Early records were picture records. Cave men drew pictures to warn and inform. The Greeks utilized the school journey, the sand as a blackboard, and real objects or things in their instructional processes. Forerunners of modern education used visual instruction. Such famous pioneers as Comenius, Rousseau, and Pestalozzi emphasized it.
2. Whereas schools of the past used visual materials, modern science and inventions have opened vast new possibilities in the development of concrete materials for teaching purposes.
(a) The invention of the photograph and of photo-engraving have made possible the illustration of magazines, newspapers, books,
:McClusky, F. D., et al., "The Place of Visual Instruction in the Modern School,' 1932. (Syllabus of a proposed text.)