ABSTRACT. A Study on the Manoeuverability of Vessels. by Yasuyoshi Nakajima.
The course stability or the manoeuvering abilityof a vessel subjected to permanent disturbances (waves, winds, etc.) is one of the most important problems for seaman.
The author studied this subject and obtained an analytical method. He calculated the wind effect on the menoeuVerability of some train ferries as an example and shows that the results agree with actual experiences.

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Unsteady Motion of a Submerged Cylinder. by Seizo Motora.
It has been well known that, when a solid is mov ing in an infinitely spread fluid, the whole effec of the fluid may be represented by an additional or virtual mass, and its magnitude does not vary with the speed of the solid.
In this paper the author calculated ths effect of the free surface under an expectation that the additional mass of this case must vary with the speed or the Froude number of the solid.

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The author calculated in this paper the lateral force and turning moment acting on a ship among waves, and then 'calculated a forced yawing of a ship among waves.

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In order, to estimate the wave-making resistance for the rolling of ship, the wave-making resistance for a flat plate on the free surface of water is here calculated as a limiting case and compared with that for the vertical flat plate which has been treated by T.H. Havelock.

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A beam composed of two plates mutually fixed at their both ends recieves a transverse load, and acts as a canti-lever. One of the plate being under compressive stress, the state of stable equilibrium is only possible if the load is under certain critical value. This critical value of transverse load has been obtained in a simple formula.

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A corrugated washer can be used as an adjustable washer in the free wheel of the bicycle (instead of the usual ring plates). A study is made with an application of the theory of the orthogonal aeolotropic plate. From experiments the following result was obtained: the corrugated washer which has 20 waves, wave height 0.7mm and thickness 0.4mm, can adjust a 0.12mm clearance continuously.

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In this paper the author considered the fact that, in the case of steady flow, if the thermo-pipe is equipped with an uncovered flange, the loss of heat through the flange surface is considerable, and reached the conclusion that a rather large proportion of heat transfer is carried out through conduction.

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