Some wire ropes become large in the diameter when load is added, and the other wire ropes that have been used, become bigger in the breaking load than new product. In order to explain these phenomena and establish the new method that load without breaking test, I made this study as the base of it.
At present we use some kinds of diameter in a wire rope
Instead of these I found a new diameter, a clamped diameter, and conceived the method for the measurement of it.
At present we use also some kinds of breaking load as follows.
Therefore, I made clear up these relation and besides these proposed the total minimum sectional area of a wire rope and then obtained the relation between this and a clamped diameter.

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The aim of this laboratory investigation, tested in the glass tube, was to observe the change of flame length of methane or methanecoal dust explosion, when coal dust or rock dust is in the gallery. The flame length and its form was measured by the photo.
When coal dust in the gallery is ignited with the flame of methane explosion, the flame length of coal dust explosion caused by the methane flame differs with the amount of coal dust existed in the gallery, and the distance from the center of gas explosion. The flame is the longest at a certain amount of coal dust and it is at a certain distance from the centre of gas explosion.

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For the cleaning of lead concentrate contaminated with some secondary silicate minerals, . kerosene was tried as the fl otation reagent instead of the ordinary frothers to make the silicate gangue float, depressing lead minerals with patassium dichromate and soda ash in this circuit.
The ore are consists of galena (1.5 to 2.0% Pb), chalcopyrite (0.3 to 0.4% Cu), sphalerite (9.0 to 12.0% Zn), pyrite (15.0 to 17.0% Fe) and gangue minerals. The principal gangue minerals are quartz and feldspar containing secondary silicate minerals such as chlorite, sericite and talc. The ratio of secondary silicate minerals to other gangue minerals is about 15: 85 by volume. These secondary silicate minerals cause some serious difficulties to get a high grade lead concentrate.
When it is difficult to improve the lead content in concentrate to above 50 per cent, kerosene flotation seems to be effective.
This achievement was applied for the recovery of high grade lead concentrate at Taro, flotation plant.
Kerosene was added to the rough lead concentrate in the last cleaning circuit with soda. ash and potassium dichromate which were used to inhibit lead minerals. The film of gangue minerals floated was skimmed off and the depressed lead concentrate was discharged through the tailing gate of the flotation cell. Thus we could raise the lead content of the concentrate to above 50% sacrificing only 2 to 3% of lead recovery.

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Floatability of copper- or silver-pre-activated sphalerite in potassium ethyl xanthate solution was studied. Furthermore, the thickness of the hydrophobic layer formed on the surface of the samemineral was estimated from the iodometric measurements of the concentrations of the xanthate before and after the flotation. The results thus obtained were compared with those of the electron diffraction investigations described in the first and second reports of this research.

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White metals for socketting the rope ends used in mine haulages, cable cranes and suspension bridges etc. are treated. The adhesive forces between some white metals and the steel wire are compared and the effects of the varing conditions of preparation are investigated.
The relation between the adhesive force and some mechanical properties of the white, metals is also briefly described.

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