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AN INTERDISCIPLINARY TEAM from Purdue University is developing a comprehensive set of educational materials for agricultural safety and health for OSHA, of the U. S. Department of Labor. The team from the Purdue school of Agriculture, school of Veterinary Medicine, and the school of Humanities, Social Science and Education are working for a year and a half to gather and catalog all existing safety materials, and to produce new ones to meet nationwide needs. The project was begun on July 1, 1974 and is scheduled to be completed by December 31, 1975. The project team includes John B. Liljedahl, professor of agricultural engineering, project leader; Avery H. Gray, assistant department head, 4-H and Youth; William H. Hamilton, agricultural education; David H. Loewer, Extension agricultural engineer; David L. Matthew, Extension Entomologist; Vernon B. Mayrose, Extension animal scientist; Ken Weinland, Extension veterinarian; Bruce A. McKenzie, Extension agricultural engineer; James L.

The Purdue Univ. soil-vehicle laboratory located in the Agricultural Engineering Building was used to study the effect of dual, single, and tandem drives on artificial soils. The dual versus single tire comparisons were made with 4.00 × 8 tires. Two tandem drive combinations were used. The first combination utilized 4.00 × 8 tires for both the front and rear wheels, and the second combination used a 4.00 × 8 tire for the front wheel and a 6.00 × 12 tire for the rear wheel. Dual tires performed better than single wheels of the same weight when tested on loose soils. The full advantage of dual tires was not obtained without lowering the inflation pressure below that of a single tire of the same weight. A weight distribution of 60% of the total weight on the front wheel produced better performance for the tandem drive using equal size tires than did the weight distribution of 50% or 40% on the front wheel. The performance at a tire pressure of 6 psi was superior to that at 9 and 12 psi.