Aluminium, single crystal or coarse grained, lightly deformed in tension (1-12%) was examined by X-ray diffraction microscopy (Berg-Barrett method).(1) The X-ray micrograph shows two sets of lamellae consisting of white and darkbands. One set of them (lamella K) is almost parallel to the plane of kink bandsand another set (lamella S) to the primary slip plane, though the latter occasionally has an orientation considerably different from it. Lamella K is revealed long before kink bands can be detected optically, while lamella S is often absenteven at the stage of deformation that optical examination clearly reveals many slip bands. (2) The crystals whose orientation lies near the  zone show only lamella K, while those near the  zone show both lamellae. (3) A slightrotation of the specimen may bring some region in the white band into a reflecting angle, the position of maximum intensity of the dark band remaining unchanged. From this fact, it may be supposed that the band figure is due to the existence of band regions subjected to local rotation as well as to an extinction effect resulting from distortion. (4) The appearance of this figure is unaltered by annealing until polygonization occurs.
Some adjustments of the amplifier zero-point and of the compensating circuit for the dark current of the photo-multiplier tube were necessary for the photometric circuit of the photoelectric spectro-analyser during the long time in measurements. Using stable d. c. power supplies and wire-wound resistors of manganine, the zero-drift of the amplifier can be reduced to the negligible order of magnitude. The dark current can be automatically compensated by a new circuit which is composed of a difference amplifier, memory capacitors for the dark current, suitable switches to change the circuit conditions, etc. The analytical results of the speetro-analyser can now be automatically recorded by the new circuit.
The starting potential of a A-Hg cold cathode discharge tube with quartz wall was measured under irradiation. The following phenomena were observed; (A) In d. c. measurement (1) When irradiated with a germicidal lamp a remarkable rise of the starting potential was observed, showing the more rise, the higher the wall temperature. (2) The rising effect by local irradiation was stronger when irradiated near the anode than near the cathode. (3) The starting potential remained high even after stopping irradiation, showing remarkable after effect. (4) High pressure Hg-arc, fluorescent lamp, incandiscent lamp, Al-spark, Cu, Fe and C-arc, and scattered light from window had also the rising effect. (B) A feeble intermittent discharge operated by a. c. source was stopped by irradiation with low intensity u. v. -ray.
The some types of liquid level meters with the Gamma-rays from radioactive materials have been reported. In this report, I have studied the Gamma-ray liquid level meter, in which there is the linear relation between liquid depth and counting rate, and also its static characters and dynamic ones, when I use the counting rate meter.