As the results of study on a automatic control of the torpedo, we concluded that: (1) The statical stability of body is needed to select the proper value due to the performance required, (2) the time lag of steering mechanism is most important for the condition of dynamical stability, (3) utilization of a rate gyro relieves the above condition. Moreover we discussed the effect of a sensitivity for the inclination and the depth on the dynamical stability, the importance of fin effect the propellers have, the effect of a negative buoyancy and a trim, and the practical characteristic equation.

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A number of asuumptions and simplifications have been employed in the development of the various methods, approxiamte and exact, presented in the author's foregoing papers to facilitate mathematical manipulation. To validate these methods would require the application of these to actual problems where test data are available for necessary theoretical computations. This will be done in this paper by making use of the data extracted from the comprehensive series of scale model tests of a Compur shutter, conducted by Mr. T. Hashimoto of Chiyoda Kogaku Seiko K. K.The results thus obtained indicate good agreement of theory and test.
Furthermore, two numerical examples are worked out by using the exact methods, to illustrate the construction of two different patterns of steady-state motion, viz., the twopoint-collision and colliding-and-sliding steady-state motion.

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In order to obtain some fundamental informations on the mechanism of cutting fluid action, sulphurized spindle oils in which the sulphur content was finely adjusted in a wide range were used in cutting steel with H.S.S. tool and carbide tool.
As the results of the experiments, it was disclosed that the type of the chip transformed clearly from the shear type to the flow type with the increase of sulphur content in the spindle oil. Knowledges of lubricating action available for practical metal cutting were also obtained.

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In order to examine the distribution of heat generated in the vicinity of cutting edge in hot machining by electric current, magnified models of orthogonal cutting were made from tin foil, low AC voltage was given between tool-side and work-side electrodes and distribution of heat generated by electric current was studied from equipotential lines which were measured by vacuum-tube-volt-meter.
In this paper the Influences of following six factors upon the distribution of electric potential on the tin foil models are examined. (1) Rake angle (2) Shear angle (3) Depth of cut (4) Contact length (5)Flank wear (6) Specific resistance of tool and work materials.

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The properties of the polished surfaces of semiconductor crystals by optical and metallographic operations have been investigated by means of micro-etching, phase contrast microscope and electron microscopy. It is concluded that micro-cutting introduces the aggregations of fine scratches on the metallographically polished surfaces, and thermal flow plays an important part in the origination of the optically polished surfaces. Moreover, the depth of worked layers on polished surfaces including the additional influence isestimated to be a value of 1-3μ.

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