Figure F10. A. Schematic sketch of the Göttingen Borehole Magnetometer (GBM) showing inclinometer, fiber-optic gyros, and the Förster-magnetometer triplet (from Virgil et al., 2010). B. Schematic drawing of the GBM tool string as deployed downhole during Expedition 330, including a decentralizer (to slow tool rotation), a knuckle connection, a centralizer (to keep the GBM in the center of the hole), and two sinker bars (made of tungsten carbide and nonmagnetic aluminum), with the nonmagnetic one positioned just above the GBM.
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