75—1型简易应力仪是国家地震局土应力仪组研制,并在全国推广的、用于地震预报的一种观测手段。它的探头由四个传感元件按45度交角焊接在薄壁铜环里,外部用塑料筒密封,采用不平衡电桥原理进行测量。我市从1978年起逐步安装使 75-1-type simple stress gauge is the National Seismological Bureau earth stress instrument developed, and the promotion of the country, for the earthquake prediction of a means of observation. Its probe consists of four sensing elements at 45 degrees angle welded thin-walled copper ring, the external sealed with a plastic tube, using unbalanced bridge principle to measure. Our city has been gradually installed since 1978