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选用1～2mm厚挺括的纸片,上面铺上白纸,粗糙的一面向外(注意:白纸一定要平整)。四周用钉书针固定。然后,将厚纸片水平放置在条形或蹄形磁铁上,均匀地撒上铁屑。轻轻敲击纸片,一幅磁力线谱就出来了。铁屑要尽可能的少,一是能清晰的体现磁力线,二是便于以后的固定。最后,距磁力线谱15～20cm处均匀喷撒发胶,发胶的用量视铁屑的多少而定。轻轻抽掉磁铁,一幅磁力线谱就固定好了。
Selection of 1 ~ 2mm thick crisp paper, covered with white paper, rough side outward (Note: white paper must be smooth). Staple around with staples. Then, place the cardboard horizontally on a bar or shoe magnet and sprinkle the iron dust evenly. Gently tapping the paper, a magnetic line spectrum came out. Iron filings should be as small as possible, one can clearly reflect the magnetic field lines, the second is to facilitate the future fixed. Finally, 15 ~ 20cm away from the magnetic line evenly spray hair gel, the amount of hair gel depending on the amount of iron filings may be. Gently pull the magnet, a magnetic line spectrum is fixed.