| 摘要 |
672,093. X-ray apparatus. PHILIPS ELECTRICAL INDUSTRIES, Ltd. May 24, 1950 [May 26, 1949], No. 12973/50. Class 98 (i). A diffraction camera for X-ray examination of crystalline substances, Fig. 1, comprising a cylindrical chamber 1, of which the wall is provided with diametrically opposite apertures 2, 3 to allow passage of an X-ray beam, and coaxial tubes 4, 5 of narrow cross-section in register with the apertures, and ending in the vicinity of a centrally-placed specimen 6, a film strip 7 for photographing diffraction images being provided on the circumference and clamped in position by means of a stop 8 fixed to the wall and a stop 9 movable along the wall, is characterized in that the film clamping means are positioned on the wall between the axis of the X-ray beam and a radius of the chamber which is perpendicular thereto. Preferably, the clamping means are positioned at an angle between 20 and 75 degrees with the X-ray beam. The film 7 has apertures 11, 12, Fig. 4, which register with apertures 2, 3 in the chamber 1, one of the apertures being formed at a distance between 0.2 and 0.055 times the length of the film from one end thereof. The apparatus is particularly useful when no strong backward diffraction of the X-rays takes place. Rings such as 17 then surround the aperture 12, while a wider ring 18 also appears in part at the other end, enabling the effective diameter of the film to be found. |
