| 摘要 |
PCT No. PCT/DK89/00136 Sec. 371 Date Nov. 21, 1990 Sec. 102(e) Date Nov. 21, 1990 PCT Filed May 24, 1989 PCT Pub. No. WO89/11628 PCT Pub. Date Nov. 30, 1989.The heat protective covering comprises at least two concentric and cylindrical plate layers (6, 7) fixedly mounted round for instance a gun barrel (1). Rows of holes (12, 13, 14, 15) are shaped along and in, respectively, the upper and lower lines of generatrix of each plate layer (6, 7). The heat protective covering ensures that the bore or the central axis of for instance the gun is completely parallel to the line of sight irrespective of wind and weather from one side, such as a strong sunlight, wind or a heavy shower from one side.
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