吊圆仪是为测设急倾斜天井及天井幅穿而自制的一种简便测量仪。对于矿体和围岩含有磁性无法使用罗盘仪,且又无法使用普通经纬仪(包括悬挂式经纬仪)的情况下,适用于低精度的导线测量和一般精度要求不高的工程测设工作。实践证明:按罗盘导线测量规则,用吊圆仪测水平夹角,支导线 The cradle is a simple gauge made for the purpose of measuring steeply pitched patio and patio drafts. For ore bodies and surrounding rocks containing magnetic can not be used compass, and can not use the ordinary theodolite (including hanging theodolite) case, suitable for low-precision wire measurement and general accuracy of less engineering survey work. Practice has proved: According to the compass wire measuring rules, measuring the horizontal angle with the round pendant, branch wire