Roller-burnishing is a machine-work to get a smooth surface efficiently by turning and then applying the roller to the surface and has long been practised on the axle journal and pins etc.
Recently researches on roller-burnishing have been carried out actively, so the details on quality of roller-finished surface and working condition are being revealed.
We reported formerly on the lubrication test of roller-finished surface. Here we have carried out some basic tests on relation between the roughness of roller-finished surface and working condition and led a practical theory on the mechanism of roller-burnishing.
First, in order to get a smooth surface we must select the turning and roller-burnishing condition in connection with work material.
The conclusions are as follows:
(1) Finishing by a point tool is superior to by spring tool from standpoint of smoothness of surface, accuracy of cylinder and efficiency of operation.
(2) A barrel type roller (barrel curvature 1050mm) is better than a cylindrical one. We must select proper rolling pressure and feed in connection with barrel curvature of roller.
(3) A proper rolling pressure is nearly proportional to R₁^1/2 and h₀ where R₁ is the barrel curvature and h₀ is the roughness of turned surface. Rolling speed is rather independent upon the finished surface, but repeating of rolling has some effect on it. Concerning lubricant, light oil is recommendable.

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[in Japanese]

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In the first report we treated the statical characteristics of low pressure- and vacuum-type pneumatic gages of length comparator type in that case d₁>3 d_B where d₁ is the diameter of the jetting opening and d_B is the diameter of the orifice bore for supplying air to the back pressure measuring chamber. In this report the characteristics in case of d₁<d_B were obtained. The results were given from general relations between non-dimensional quantities and can be used to design air gages and various automatic governing valves of fluid type.

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With respect to the aging effect and thermal change of the resting points of the beam precision balances, there are several researches by such investigators as Manley, Dean, Conrady and Buchan.
But causes of the change has not yet been cleared up quantitatively. The writer observed the changes of Zero Points (Z. P.) caused by temperature about a few balances, and the causes were investigated through the observed data and ratiocination. Among the several causes of the change of Z. P., the fine displacements of the chief and both sides prism were the main origin of the phenomenon. There was observed quantitative coincidence of the experimental values with calculated one. Of course this research should be begun anew with other balances, as this fact was established only with the balance No. 9. These experiments were made with the balance being enclosed in a constant temperature box and the dimension of the parts of balances were precisely measured by the spectrumcomparator.

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