Shear tests were performed on several prepared samples of granular and powdery bulk materials to investigate the following parameters: particle size and distribution, particle movement, moisture content, consolidation of material, bulk density, void ratio, porosity, volume change, and strain rate. A series of shear tests was performed with weight-percent ratios of minus 0.185-Inch Tertiary sand and 1 1/2- by 1/2-inch Tertiary gravel mixtures, and weight- percent ratios of minus 200-mesh limestone (rock dust) and minus 200- mesh bituminous float coal dust. A comparison was made for shear test results obtained with rectangular and circular shear cells utilizing the large and small direct shear testers. Specifically, the shear results obtained include the angle of internal friction or shear strength of the tested material under known consolidating pressures, and the kinematic angle of friction or coefficient of friction between the interface of a bulk material and a sample wall material. The experimental procedure, tests, and results are given for each parameter investigated.