目的各勘探隊對於磁鐵礦測定方位角工作,除个别的使用電测仪測量外,其餘大都採用定向鑽桿測方位角。雖然這種方法在某些方面還存在些缺點,但在未有其他更好的方法來解决磁鐵礦中測定方位角的問題以前,定向鑽桿測方位角的方法,是值得繼續改進應用的。為此,願將我們使用此一方法的實際體會提出来,供大家參考。一、定向鑽桿的製作首先把沒有扭捲和沒有彎曲的良好鑽桿,在地平面上連接起來,進行地面定向工作,使定向鑽桿上的母綫保持筆直,以保證測得結果的正確。其方法是先在地面上每隔2公尺釘上一個水平樁,墊放一根200 Purpose Each exploration team for azimuthal magnetite work, except for the individual use of electrical measuring instrument, the other mostly used directional drilling rod measured azimuth. Although this method has some shortcomings in some respects, until there is no other better way to solve the problem of azimuth measurement in magnetite, the method of orienting the drill pipe to measure the azimuth is worth further improvement. . For this reason, we would like to put forward our practical experience of using this method for your reference. First, the production of directional drill First of all, there is no torsion coil and no bending of the good drill pipe, connected to the ground level, the ground orientation, the directional drill rod on the straight to ensure that the measured results are correct . The method is to first nail a horizontal pile every 2 meters on the ground and place a 200 on the mat