The purpose of this paper is to provide a reference information for directivity and other characters of portable survey meters, which are connected with GM-tube, Bi-cathode GM-tube and scintillation detector.
Directivity of these instruments has sharp character for radiations in order of ³²P-βray, radiations of carnotite and ¹³⁷Cs-γAray. These characters depend on absorption of the probe and the envelope. It is the only special case that these are calculated by the cross section of the materials in the detector head. Then the calculated values agree with the observation values.
In this study, it is interesting with relative counting efficiency for various radiation sources. There is no wide difference between counting efficiency by the GM-tube survey meter and by thescintillation for the radioactive minerals which are secondary or thin layer distribution. It is concluded that the above mentioned property due to abundant ratio of β-and γ-rays of the minerals. Therefore, there is a wide difference between counting efficiency and directivity of the survey meters for the above minerals and these for the others, which have different conditions of distribution and degree of equilibrium.

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As the method of stress measurement reported in the previous paper was somewhat qualitative, we have continued to study to increase accuracy and reliability. By means of attaching a detachable compensator to the photo-elastic apparatus, the accuracy of determining stress in glass test pieces has been much elevated. There has arisen a necessity to investigate on the test piece again, corresponding to the improvement of the photo-elastic apparatus. Accordingly three kinds of test pieces have been investigated and the relation between the stress in the body of which stress is inquired and the stress in the glass test piece has been cleared out for each kind of test piece. We have discussed also on the method of attaching the test piece to an elastic body, which has much influence to the accuracy.

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Mine tubs are not always moving in their working cycle. Sometimes they run quite rapid, and sometimes slowly, and very often stand still at the point they stopped.
The time consumptions of each mine tub at the reposing spots are not same. They take many various values. But if we observe them carefully, we can find regularities in their distributions.
This time, I investigated their distributions using Pearsor's statistical method. For application of the method by using the logarithmic classification of wasted times, I could get the conclusion that the distribution of spending times is Gauss' one. That is to say the formula of the distribution is shown by n=N/√2π1/σ∫x_ix_i-1e^- (x-x₀)/2σ²dx
Here, n=number of circulating waggons in the timeinterval between x_i-1 and x_i.
N=tolal number of tubs carried out from the pit month.
σ=a comstant.
x=lonat, α=apositive nurnber which is the base of lagarithm for t. t=wastlng time.
x₀=loααt₀, t₀=mean spending time at the point where each tub stands.
This conclusion is obtained from the data which collected at the Tikubetu Coal Mine, Haboro Colliery.So its apPlication to another mine is donbtful, owing to the wauting of other mine's data.

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Samples of sphalerite used in this experimental work and experimental procedures were same as in the experiments on unactivated sphalerite previously reported (the report I).
From the results of this investigation the following conclusions were obtained:
(1) In the solution in 'which pH value was not regulated, adsorption isotherm of KEtX well fitted the Freundlich equation when its equilibrium concentration was less than 100 mg per 1. On applying the data obtained to the Langmuir equation, it appeared that multimolecular adsorption of KEtX or chemical reaction of some unknown mechanism may have occurred at the surface.
(2) The amount of KEtX adsorbed decreased with increase in pH value of solution or decrease of hydrogen ion concentration [H+] in the solution and was given by the following equations logΓ=logΓ₁-k (pH) or Γ=Γ₁ [H⁺] Kwhere r is the amount adsorbed, F1 is the amount adsorbed at pH=O or [H⁺] =1, and k is a constant depending on total xanthate concentration or the xanthate ion concentration. But it was concluded that influence of xanthate ion concentration on its adsorption predominated over the concentration of hydroxyl ion.
(3) If the amount of KEtX adsorbed was equal, there was always a correlation between xanthate ion concentration [X^-] and hydrogen ion con concentation [H⁺] expressed by the following empirical equation [H⁺] ^0.15·[X^-] =mwhere m is a constant depending on the amount of KEtX adsorbed. This fact indicates that the correlation proposed by Barsky can be generally applied to the case above mentioned.
(4) Within the limits of the experiment, it was ascertained that alkali regulating agents such as KOH, NaOH, Ca (OH) ₂ and Na₂CO₃ did not cause different effect on the adsorption of KEtX.
(5) Experiments on adsorption rate of KEtX was carried out in the cases of different concentrations of KEtX and pH values respectively. From these results, the rate of adsorption with time t was generally given by the following equationsΓ=Γ₁+K log t or Γ=Γ₁t^1/nwhere k and 1/n are constants. And it was found that at a fixed pH value these constants increased linearly with increase in KEtX concentration and at the same KEtX concentration had a relation with hydroxyl ion concentration [OH^-], expressed by the following equations k [OH^-] ^α=b or [OH^-] ^α/n=bwhere a and b are constants depending on the KEtX concentration.
(6) The adsorption rate and the total amount of KEtX adsorbed both increased with rise of temperature. This fact suggested that chemical reaction of some unknown mechanism was implicated in adsorption of KEtX and it is presumed that oxygen in solution may have played an important role.
(7) It appeared that zinc xanthates behave themselves for adsorption quite as well as potassium

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The mechanism of the edge effect was suggested; the T_s-T_ts axis rotates at the edge point and the T_l keeps making θ_l (actually making θαθγ) with this axis as the liquid is advancing or receding, if T_l, T_ls and T_l represent the solid-air, solid-liquid and liquid-air interfacial tensions respectively, and θ_e, θα and θγ are the equilibrium, advancing and receding contact angles respectively.
This is applied to the formation of the edge angle, and also accounts for the floatability of some shaped solid with zero contact angle. Consequently, the floating solid, in all cases, must satisfy both the supporting force equation (f₁ or f₂) and the Young or the Adam equation, which are very like to the correlation of the string and the knot with the suspended body.

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In connection with the utilization of titanium the problem of iron sands has become to have great importance. The purpose of this investigation is to enlighten the structure and magnetic properties of these iron sands by X-ray analysis, thermomagnetic measurements, microscope, and chemical analysis on synthesized samples in the Ti0₂-Fe₂O₃ FeO series.
The results obtained are as follows:
(1) Ti0₂-Fe₂O₃ series By X-ray analysis the presence of only one compound Fe₂TiO₅ was detected, which showed orthorhombic structure.
(2) FeO-TiO₂ series This examination revealed the presence of different compounds FeTi₂O₅ and ulvospinel Fe₂TiO₄ besides ilmenite FeTiO₃, and the FeTi₂O₅ showed orthorhombic structure analogous to Fe₂TiO₅.
(3) Fe₃0₄-Fe₂TiO₄ series It was ascertained that solid solution was complete between Fe304 and Fe₂TiO₄, and its saturation magnetization decreased with increasing the amount of Fe₂TiO₄ in Fe₃O₄.
(4) Fe₂O₃-FeTiO₃ series Also in this system solid solution would be formed. The obtained strongly magnetic ilmenite showed homogeneous structure and its chemical composition corresponded to Fe₂O₃·2FeTiO₃. It is interesting fact that the curie point showed about 100°.
(5) Fe₂TiO₅-FeTi₂O5 series Formation of the same crystal structure suggests that solid solution is possible between these two compounds.

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Chemical and mineral composition of the converter matte and refined matte and thermal change of refined matte were studied.
By the treatment of crude nickel matte in converter Fe first, then S and at last Ni component is oxidized according to the affinity of these component with oxygen. Principal mineral of the converter matte taken out from the converter during the procedure changed from FeS to pentlandite and at last to Ni₃S₂. Refined matte thus formed conststed of Ni₃S₂ and small amount of metallic Ni.
On Calcination in air the weight of the refined matte increased between 400 and 700°C owing to the formation of NiSO₄. At the same time considerable amount of NiO was also formed. Above 750°C NiSO₄ was almost decomposed to form NiO.

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