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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切削油剤の作用機構のうち潤滑機構について考察するための資料を得るために,いおう華を添加したスピンドル油を供給して切削状態の変化を調べ,つぎのような結果を得た。
1. 他の切削条件が一定であつても,スピンドル油中のいおう含有率が多くなるにしたがつて,削りくずは明りようなせん断型から完全な流れ型に移り変わる。これはいおう濃度によつて,切削油剤としての極圧潤滑性が異なるためであると推定できる。
2. 切削抵抗の時間的な変動の状態および平均値がいおう濃度によつて異なり,その状態は本実験においては三つのタイプに分類できる。平均値はいおう濃度の増加にしたがつて減少しS0.500%程度の濃度において最低値に達するか,ある値に漸近する傾向を持つが,分散値はS0.050%程度の濃度までは乾切削の場合よりもかえつて大きい。
3. 切削初期において,切削状態が安定するまでの時間は,いおう濃度の増加および削り速度の増加にしたがつて減少する。
4. 削り速度が100m/minの程度においても,いおう分子は削りくずと工具との接触部において作用しうると推定できる。
5. 潤滑効果を期待して切削油剤を使用する場合には,ある一定量以上に切削油剤を供給しても無意味である。
6. 反応系と生成系の自由エネルギ差を比較することによつて,鉄といおうから硫化鉄のできる反応は,本実験における切削条件の程度では十分に進行するといいうる。

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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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