Decomposition gases of BaCO3, SrCO3, and BaSr(CO3)2 were studied by means of a microgas-analyser. Although the major part of the decomposition gas was CO2, considerable amount of other kinds of gas; CO, HCO2OCO2HCO2 werereleased from the binder, the base metal and by the mutual reaction between gas and metal. The exhaust velocity have serious effect upon the decomposition of carbonates. Experiments on the decomposition velocity and the dissociation pressure showed that each component carbonate usually decomposes separately even inthe solid solution BaSr(COCO3)CO2. Activation energiesfor the decomposition of BaCOCO3 and SrCOCO3 were estimated as about 102 Kcal/mol and 56 Kcal/mol respectively.
Following experimental results were obtained. 1) If there is no transference of solution products at the anode except by diffusion, the limitingelectric current decreases to zero as the polishing proceeds. This case can be shown experimentally when the anode is held underneath horizontally and facing upwards. 2) If the solution products at the anode are transfered by some otherway than diffusion and if its concentration at any given distance from the anodeis maintained constant, the limiting current decreases to a certain definite value. This case can be shown when the anode is held vertically.
Protective films produced on steel surface in 5% NaCI solution containing several inorganic inhibitors were investigated by electron diffraction method. Although corrosion depends on the condition of the solutions, in a certain range of concentration, each solution showed appreciable inhibiting effect especially with Na2HPO4 and ZnSO4. In general, surface product is γ-Fe2O3. H2O with underlying γ-Fe2O3. Hydroxide could not be recognized; only in Na2HPO4 solution, yellowish white precipitate ofcolloidal Fe(OH)3 was observed. The process of corrosion and inhibitation in these solutions is considered as follows; or _??_d _??_ Depending on whether the equilibrium point is on the right side or on the left, passive or active state of steel surface is determined.
Quantity of nitrogen contained in hydrogen gas obtained by electrolysis of water using platinum electrodes and that contained in the gem of fountainpen nib were measured. The gem was a specular nitrogenized alloy and did not react with any acid or alkali. Volume percentage of 0.35 of nitrogen in the case ofhydrogen gas and 0.000020g of nitrogen in the case of gem of 0.0013g in weight were obtained.
The relation between temperature effect and internal resistance in atemperature range of 5-50°C, and the effect of moisture on the life of a selenium blocking layer photocell are described. The photo-current in the external circuit decreases by the rise in temperature. It is caused by the fact that the internal resistance of photo-cells decreases with the rise in temperature. While photo-cells in ordinary state showed sensitivity drop of 20_??_30% in 3 years, vacuum sealed photo-cells showed little drop.
Measurements of the intensity of diffracted X-rays by G. M. counter become difficult when the fluctuation of the main voltage causes variations in the intensity of X-ray source. This difficulty was solved by controlling the sensitivity of the counting rate meter using the amplified output voltage of themonitor ionization chamber rendering the output of the meter to give the ratio of the intensities of diffracted and incident X-rays. With a proper control, the measurement is possible if the fluctuation of the main voltage remains within ±8%.