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Preparation and Use of 3-Dimension Projections in Teaching Soil Classification¹

ABSTRACT

The study of relationships of geomorphology, soil parent materials, and soil type is greatly facilitated in classroom teaching through the use of 3-dimension projections. Such projections can be prepared from existing photo flights already available in most areas by masking out identical photo areas in the overlap portion of adjacent photos. Separate negatives of each area placed in a stereo slide mount will enable a large group to view the topography in 3-dimension through use of stereo equipment and polarized glasses.

¹ Journal Paper No. J-3124 of the Iowa Agr. Exp. Sta., Ames, Iowa. Project No. 1151. Presented before Div. XIII-A, American Society of Agronomy, Nov. 14, 1957, at Cincinnati, Ohio.

² Professor of Soils, Agronomy Department, Iowa State College.

Received for publication January 14, 1957. Accepted for publication March 12, 1957.