The wear-properties of nodular-graphite cast iron have been researched comparing with those of piston ring cast iron.
The sample is loaded on the rolling drum made of quenched steel. The loaded pressure is 10kg/cm², and the rubbing speed varies from 0.15m/s to 2.3m/s.
The pearlite-type nodular cast iron is the most resistive to wear, but the bull's-eye-type is less resistible than the piston-ring cast iron. In the nodular cast iron containing phosphor abunduntly, the bands of cementite appear in the steadite, and the maximum point of wear shifts to low rubbing speed of about 0.5m/s. Consequently the resistibility to wear is comperatively high at the speed between. 1m/s and 2.3m/s.

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The orientation angle of the light reflected diffusely from the ground glass surface is not zero, even when the incident beam is at polarizing angle. It was ascertained that a constant relation exists between the values of such orientation angles and roughness. Moreover, assuming that regular reflection from the small parts in a rough surface of glass may account for the diffusely reflected light, we obtain theoretically a mean inclination angle of surface-roughness from the relation between both of the incident and orientation angles.
In the experiment, the yellow and plane-polarized beam with 45°orientation angle was made incident on the ground glass surfaces, and orientation angle of the reflected plane-polarized beam was measured using the plate, which was half-shaded by cellophane, and polarizing filters.

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The thickness comparator type was treated in the first report. Now in this second report concerning the wire comparator type, which is another case of the fundamental uses, the relationship among its sensitivity, the suitable size to be measured, the dimensions of the path of escaping air, and its using way is analysed dynamically as well as in the first report, When the ratio of diameter of two bores is larger than about two, the characteristics are generally similar to those related in the previous report with respect to the diameter of the clearance of air-escapement. If the ratio is small, the magnification becomes smaller. But, on the other hand, the suitable clearance to be measured becomes larger, and the errors caused by the atmospheric variations, the eccentricity of wire in the air-escaping bore, and the distorted circle of the section can be negligible. From these points it is very suitable as the comparator for wire thickness or for fibres and textile materials.

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[in Japanese]

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