In order to study on the process of fracture of the projected shots, steel balls and glass beads, 10 channel counting apparatus was designed. This apparatus consisted of a photo electron type counter, pulse amplitude discriminators and counters for 10 channel counting.
Silicon photo diodes were applied as the converter, differential amplifiers as the discriminator, and electronic and electro-magnetic as the counter.
The apparatus counts the balls greater than 0.6mm O. D. at the rate of 555per second.
If the diameter difference of two balls is greater than 0.048d, both diameter of balls can be measured exactly, where d is the ball diameter.
The diameter frequency distribution of shots and glass beads obtained by the apparatus agrees approximately with that obtained by the projecter.

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Experimental investigations were performed to obtain fundamental data for control of physical properties of fiberboard in dry process. A relation was found between power required for mixing of wood fiber and operational conditions of a blender. The experimental batch blender was about 140l in volume.
From the experimental results, it was found that power required is proportional to the amount of fiber in the blender, rotational speed of a mixing impeller and the amount of water added unless it is more than 30%. When water was added to give more than 30% water content, power required was found to have a tendency to approach to a certain constant value.
It was also found that the shape factor of fiber had negligible effect on the power requirement.

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By making the capillary suction pressure p_k in green pellet a intermediate, the correlation between the strength σ of green pellet and the relative saturation of voids in pellet ψ was investigated, where the published data of D. M. Newitt's study were used after rearrangement. In consequence, both the dimensionless functions of p_k and σ, i.e. X≡p_k⋅d_vs/α⋅cosδ⋅ε/1-ε: Y≡σ⋅d_vs/c⋅ψ⋅α⋅cosδ⋅ε/1-ε proved graphically to depend on ψ alone in the next same equation for the different groups of pellets made of sands having rather narrow size distribution. X or Y=k₁ exp [k₂/ψ] for ψ<1

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