T.O. 33B-1-13-4Figure 3-2. Horseshoe Magnet with Poles Close Together.Figure 3-3. Horseshoe Magnet Fused into a Ring.3.1.6.1.2A transverse crack in the fused magnet or circularly magnetized part (see Figure 3-4) will create a leakage field withnorth and south poles on either side of the crack. Some of the magnetic flux (lines of force) will exit the metal andform a leakage field. Magnetic materials or particles will be attracted by the leakage field created by the crack, formingan indication of the discontinuity in the metal part. This is the principle whereby magnetic particle indications areformed.Figure 3-4. Crack in Fused Horseshoe Magnet.
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