The present Paper refers to the fundamental research in manufacturing sponge iron from iron ore in Manchukuo.
The experiments were made under abont 1, 000°C. using a small fixed tube furnace, rotary furnace and semi-industrial rotary kiln with respect to the following problems:-
1) Size and form of ore
2) Preliminary roasting of ore
3) Nature of reducing gases
4) Quantity of gas flow
5) Temperature of reducing ore
6) Effect of catalytic reagents
From the results obtained, some new conceptions regarding to the manufacture sponge iron in an industrial scale are explained.

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In this paper, the author tries to determine the mechanical properties, such as tensile strength, impact resistance, linear expansion and shrinkage, of all electrically welded steel at elevated and lowered temperatures which range from -40 to 600°C.
The author may have privilege of dealing with the necessity for these investigatins as a problem, believing that our knowledge on the properties of welded steel at room temperature predicts what the properties of the same metal would be at elevated and lowered temperatures.
The absorption of nitrogen is one of the most important of the physical properties of welded Steel. The author takes up practical aspects of the influence of nitrogen on the mechanical properties on the edge-hardening.
Next, he deals with the forging properties of the metal at higher temperature, and the specific gravity of welded metal and mild steel at lower temperature.
Finally, he shows graphically the result of edge-hardening of the same metals at a very low temperature, which was created by ice-water, coagulated mercury and liquid air, respectively.

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The author determined the effects of the addition of a small amount of metals such as iron, silicon, magnesium, calcium, lead, tin, zinc, cadmium, bismuth, antimony, copper, nickel and manganese, upon the properties of aluminium (99·8%). The specimens were chill-cast in mould and were cold-drawn to wires using dies. These were annealed at 300°C for 4 hours.
For quenching, these annealed specimens were heated to 500°C or 550°C; after having been kept at such temperature for one hour, they were quenched in cold water.
For measuring the specific e'ectrical resistance, a Leeds & Northrup type potentiometer was used. All measurements were made at 20°C. The tensile strength of specimens has been determined by a Schopper's testing machine.
A summary of the results of the investigation is given below.
(1) With addition of iron, the specific electrical resistance and tensile strength gradually increased.
(2) In the hard drawn and annealed specimens, the specific electrical resistance increased with addition of silicon, whilst in the specimens which was quenched from 500°C, the direction of curves, was changed at 0·79% silicon. This result is in conformity with the solubility of silicon to aluminium at 500°C.
(3) Cadmium, antimony, lead, bismuth and tin had no remarkable effect on these properties.
(4) Magnesium, copper, zinc, nickel and manganese increased the specific electrical resistance and simultaneously the tensile strength.
(5) The effects of magnesium on aluminium which contains 0·5%, silicon were noticable. The specific electrical resistance of the hard drawn and annealed specimens was not increased, until the addition of magnesium became equivalent to the silicon content. But, the specific electrical resistance was rapidly increased, when magnesium was added more than 1·0%.
(6) The effects of calcium on aluminium containing 0·45% silicon, have shown nearly the same effects as magnesium.

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Participated in work of the party engaging specially in the repair of Japanese swords in the front, the author observed the superiority of Japanese swords in the light of the present Sino-Japanese fighting.
It is a well-acknowledged fact that the Japanese sword has an excellent sharpness. Its splendid effect has invariably been shown in action at the present crisis, there being many instances to be quoted from numerous exploits in the actural occasions.
A large number of Japanese swords being used in the front, sword makers are naturally very busy at present.
We know the physical effect of the Japanese sword from its sharpness as well as the user's skill. Besides the most important matter is our strong faith for the Japanese sword. Consequentty, the mental effect of it against the enemy is very powerful with the action of the "Japanese spirit" in it.
Therefore, we observe the Japanese sword not only materially but also spiritually. In short, the Japanese sword is considered to be a spiritual material, which stands to guard strongly and to prosper eternally the Land of Our Mikado.

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